Index of IANA Protocol Registries

Access Node Control Protocol (ANCP)
ANCP Capability Types	RFC 6320	Standards Action
ANCP Command Codes	RFC 6320	Standards Action
ANCP Message Types	RFC 6320	Standards Action
ANCP Port Management Functions	RFC 6320	Standards Action
ANCP Result Codes	RFC 6320	0x0-0xFFF: IETF Review 0x1000-0xFFFFFF: Specification Required
ANCP Technology Types	RFC 6320	Expert Review (Expert: Unassigned)
ANCP TLV Types	RFC 6320	0x0000-0x1FFF: IETF Review 0x2000-0xFFFF: Specification Required
Joint GSMP / ANCP Version Registry	RFC 6320	Standards Action
ACL TLS
ACL (D)TLS Parameters	RFC 9761	Expert Review (Expert: Dan Wing, Per Andersson)
ACL DTLS Version Codes	RFC 9761	Expert Review (Expert: Dan Wing, Per Andersson)
ACL TLS Version Codes	RFC 9761	Expert Review (Expert: Dan Wing, Per Andersson)
Ad Hoc On Demand Distance Vector (AODV) Parameters
AODV Extension Types	RFC 3561	Standards Action
AODV Message Types (for messages sent to port 654)	RFC 3561	Standards Action
Address Family Numbers
Address Family Numbers	RFC 2453 RFC 2677 RFC 2858	1-16383: Standards Action 16384-32767: First Come First Served
Address Resolution Protocol (ARP) Parameters
Hardware Types	RFC 826 RFC 5494	requests for values below 256: Expert Review requests for more than one value: Expert Review requests for one value greater than 255: First Come First Served requests for one value, no value specified: First Come First Served
Operation Codes	RFC 826 RFC 5494	IETF Review or IESG Approval
Protocol Type	RFC 826 RFC 5494 RFC 5342	The Ethertype space is administered as described in [RFC5342].
APEX Parameters
Applicable Exchange Core (APEX) Endpoint Applications	RFC 3340	Expert Review (Expert: Unassigned)
Applicable Exchange Core (APEX) Options	RFC 3340	Expert Review (Expert: Unassigned)
Applicable Exchange Core (APEX) Services	RFC 3340	Expert Review (Expert: Unassigned)
Application Access Protocol (ACAP) Numbers
ACAP Capabilities	RFC 2244	Specification Required (Expert: Unassigned)
ACAP Response Codes	RFC 2244	First Come First Served
Dataset Classes	RFC 2244	Standards Action or IESG-Approved Experimental RFC
Vendor Subtrees	RFC 2244 RFC 6075	First Come First Served
Application Bridging for Federated Access Beyond Web (ABFAB) Parameters
ABFAB URN Parameters	RFC 7833	IETF Review or Expert Review (Expert: Unassigned)
Application-Layer Traffic Optimization (ALTO) Protocol
ALTO Address Types	RFC 7285	IETF Review
ALTO Cost Metrics	RFC 7285	IETF Review
ALTO Cost Modes	RFC 9274	IETF Review
ALTO Cost Source Types	RFC 9439	IETF Review
ALTO Endpoint Property Types	RFC 7285	IETF Review
ALTO Entity Domain Types	RFC 9240	IETF Review
ALTO Entity Property Types	RFC 9240	IETF Review
ALTO Error Codes	RFC 7285	IETF Review
Authenticated Encryption with Associated Data (AEAD) Parameters
AEAD Algorithms	RFC 5116	1-32767: Specification Required 32768-65535: Private Use
Authentication and Authorization for Constrained Environments (ACE)
ACE Authorization Server Request Creation Hints	RFC 9200	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action 256 to 65535: Specification Required greater than 65535: Expert Review
ACE Groupcomm Errors	RFC 9594	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review
ACE Groupcomm Key Types	RFC 9594	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
ACE Groupcomm Parameters	RFC 9594	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
ACE Groupcomm Policies	RFC 9594	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
ACE Groupcomm Profiles	RFC 9594	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review
ACE Groupcomm Rekeying Schemes	RFC 9594	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review
ACE Profiles	RFC 9200	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action 256 to 65535: Specification Required greater than 65535: Expert Review
ACE Token Revocation List Errors	RFC 9770	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review
ACE Token Revocation List Parameters	RFC 9770	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review
Group OSCORE Admin Permissions	draft-ietf-ace-oscore-gm-admin-17	0-65535: Expert Review greater than 65535: Private Use
Group OSCORE Roles	draft-ietf-ace-key-groupcomm-oscore-21	0-65535: Expert Review greater than 65535: Private Use
OAuth Access Token Type CBOR Mappings	RFC 9200	less than -65536: Private Use -65536 or greater: Expert Review
OAuth Error Code CBOR Mappings	RFC 9200	less than -65536: Private Use -65536 or greater: Expert Review
OAuth Grant Type CBOR Mappings	RFC 9200	less than -65536: Private Use -65536 or greater: Expert Review
OAuth Parameters CBOR Mappings	RFC 9200	less than -65536: Private Use -65536 or greater: Expert Review
OAuth Token Introspection Response CBOR Mappings	RFC 9200	less than -65536: Private Use -65536 or greater: Expert Review
OSCORE Security Context Parameters	RFC 9203	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
Sequence Number Synchronization Methods	RFC 9594	less than -65536: Private Use -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
Authentication and Key Agreement (AKA)
AKA-Version Namespace	RFC 3310	Expert Review (Expert: Vesa Torvinen (primary), Jari Arkko (secondary))
Authentication Method Reference Values
Authentication Method Reference Values	RFC 8176	Expert Review (Expert: John Bradley, Mike Jones)
Authentication Option Name Spaces
Algorithm Name Space Values	RFC 3118	IETF Review
Protocol Name Space Values	RFC 3118	IETF Review
RDM Name Space Values	RFC 3118	IETF Review
Authentication, Authorization, and Accounting (AAA) Parameters
Application IDs	RFC 6733 RFC 6942	0-16777215: Specification Required 16777216-4294967294: First Come First Served
AVP Codes	RFC 6733	block allocation (release of more than three AVPs at a time for a given purpose): IETF Review other allocation: Specification Required
AVP Flags Value	RFC 6733	Standards Action
AVP Specific Values	RFC 6733	IETF Review (unless otherwise specified)
Command Codes	RFC 6733 RFC 5719	0-255: Reserved for RADIUS backward compatibility 256-8388607: IETF Review 8388608-16777213: First Come First Served with specification
Command Flags	RFC 6733	Standards Action
Mobility Capability Registry	RFC 5447	Specification Required (Expert: Jouni Korhonen)
QoS Profiles	RFC 5624	0-511: Standards Action 512-32767: Specification Required 32768-4294967295: Reserved
Author Domain Signing Practices (ADSP) Parameters
ADSP Outbound Signing Practices	RFC 5617	Registry closed
ADSP Specification Tags	RFC 5617	Registry closed
Automated Certificate Management Environment (ACME) Protocol
ACME Account Object Fields	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME Authority Token Challenge Types	RFC 9447	Specification Required (Expert: Mary Barnes, Aaron Gable)
ACME Authorization Object Fields	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME Directory Metadata Auto-Renewal Fields	RFC 8739	Specification Required (Expert: Yaron Sheffer, Diego R. Lopez, Thomas Fossati, Aaron Gable)
ACME Directory Metadata Fields	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME Error Types	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME Identifier Types	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME Order Auto-Renewal Fields	RFC 8739	Specification Required (Expert: Yaron Sheffer, Diego R. Lopez, Thomas Fossati, Aaron Gable)
ACME Order Object Fields	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME RenewalInfo Object Fields	RFC 9773	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME Resource Types	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
ACME Validation Methods	RFC 8555	Specification Required (Expert: Richard Barnes, Aaron Gable)
STAR Delegation CSR Template Extensions	RFC 9115	Specification Required (Expert: Yaron Sheffer, Diego R. Lopez, Thomas Fossati, Aaron Gable)
Automatic Responses to Electronic Mail Parameters
Auto-Submitted Header Field Keywords	RFC 5436	Specification Required (Expert: Unassigned)
Auto-Submitted header field optional parameters	RFC 3834	IETF Review
Autonomic Control Plane (ACP)
ACP Address Type	RFC 8994	Standards Action
Autonomous System (AS) Numbers
16-bit Autonomous System Numbers	RFC 1930 RFC 5398 RFC 6996 RFC 7249	RIR request to the IANA or IETF Review. Allocated following the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing.
32-bit Autonomous System Numbers	RFC 1930 RFC 5398 RFC 6793 RFC 6996 RFC 7249	RIR request to the IANA or IETF Review. Allocated following the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing.
Special-Purpose AS Numbers	RFC 7249	IETF Review
Babel Routing Protocol
Babel Address Encodings	RFC 8966	0-223: Specification Required 224-254: Experimental Use
Babel Hello Flags Values	RFC 8966	Specification Required (Expert: Juliusz Chroboczek, Donald Eastlake)
Babel Sub-TLV Types	RFC 8966	0-111: Specification Required 112-126: Experimental Use 128-239: Specification Required 240-254: Experimental Use
Babel TLV Types	RFC 8966	0-223: Specification Required 224-254: Experimental Use
Babel Update Flags Values	RFC 8966	Specification Required (Expert: Juliusz Chroboczek, Donald Eastlake)
Battery Technologies
Battery Technologies	RFC 7577	Expert Review (Expert: Unassigned)
BGP Monitoring Protocol (BMP) Parameters
BMP Initiation Information TLVs	RFC 7854 RFC 9069 RFC 9515 RFC 9736	0-32767: Standards Action 32768-65530: First Come First Served 65531-65534: Experimental Use
BMP Message Types	RFC 7854	0-127: Standards Action 128-250: Specification Required 251-254: Experimental Use
BMP Peer Down Reason Codes	RFC 7854	0-127: Standards Action 128-250: Specification Required 251-254: Experimental Use
BMP Peer Flags for Loc-RIB Instance Peer Type 3	RFC 9069	Standards Action
BMP Peer Flags for Peer Types 0 through 2	RFC 7854 RFC 9069	Standards Action
BMP Peer Types	RFC 7854	0-127: Standards Action 128-250: Specification Required 251-254: Experimental Use
BMP Peer Up Message TLVs	RFC 9736	0, 3-32767: Standards Action 32768-65530: First Come First Served 65531-65534: Experimental Use
BMP Route Mirroring Information Codes	RFC 7854 RFC 9515	0-32767: Standards Action 32768-65530: First Come First Served 65531-65534: Experimental Use
BMP Route Mirroring TLVs	RFC 7854 RFC 9515	0-32767: Standards Action 32768-65530: First Come First Served 65531-65534: Experimental Use
BMP Statistics Types	RFC 7854 RFC 9515	0-32767: Standards Action 32768-65530: First Come First Served 65531-65534: Experimental Use
BMP Termination Message Reason Codes	RFC 7854 RFC 9515	0-32767: Standards Action 32768-65530: First Come First Served 65531-65534: Experimental Use
BMP Termination Message TLVs	RFC 7854 RFC 9515	0-32767: Standards Action 32768-65530: First Come First Served 65531-65534: Experimental Use
BGP Shortest Path First (BGP SPF)
BGP-LS-SPF Link NLRI Attribute SPF Status TLV Values	RFC 9815	IETF Review
BGP-LS-SPF Node NLRI Attribute SPF Status TLV Values	RFC 9815	Expert Review (Expert: Jie Dong, Derek Yeung)
BGP-LS-SPF Prefix NLRI Attribute SPF Status TLV Values	RFC 9815	IETF Review
Bidirectional Forwarding Detection (BFD) Parameters
BFD Authentication Types	RFC 5880	Expert Review (Expert: Jeff Haas, Les Ginsberg)
BFD Diagnostic Codes	RFC 5880	Expert Review (Expert: Jeff Haas, Les Ginsberg)
Bit Index Explicit Replication (BIER)
BIER Algorithm	RFC 8401 RFC 9272	0-127: Standards Action 128-239: Specification Required 240-254: Private or Experimental Use
BIER Next Protocol Identifiers	RFC 8296	IETF Review
Blocks Extensible Exchange Protocol (BEEP) Parameters
BEEP Features	RFC 3080	Expert Review (Expert: Marshall T. Rose)
BEEP Profiles	RFC 3080	Expert Review (Expert: Marshall T. Rose)
Bootstrapping Remote Secure Key Infrastructures (BRSKI) Parameters
BRSKI Well-Known URIs	RFC 8995	Specification Required (Expert: Michael Richardson, Toerless Eckert)
Pledge BRSKI Status Telemetry Attributes	RFC 8995	Specification Required (Expert: Michael Richardson)
Border Gateway Protocol (BGP) Parameters
Additional PMSI Tunnel Attribute Flags	RFC 7902	Standards Action
ARP/ND Extended Community Flags	RFC 9047	Standards Action
BFD Discriminator Optional TLV Type	RFC 9026	0-175: IETF Review 176-249: First Come First Served 250-254: Experimental Use 255: IETF Review
BFD Mode	RFC 9026	0-175: IETF Review 176-249: First Come First Served 250-254: Experimental Use 255: IETF Review
BGP AIGP Attribute Types	RFC 7311	Standards Action
BGP BIER TLV and Sub-TLV Types	RFC 9793	First Come First Served
BGP CAR NLRI TLV Types	RFC 9871	Specification Required (Expert: Bruno Decraene, Swadesh Agrawal)
BGP CAR NLRI Types	RFC 9871	Specification Required (Expert: Bruno Decraene, Swadesh Agrawal)
BGP Data Collection Standard Communities	RFC 4384	IETF Review
BGP Error (Notification) Codes	RFC 4271 RFC 7313	Standards Action
BGP Error Subcodes	RFC 4271	Standards Action
BGP Graceful Restart Flags	RFC 4724 RFC 8538	Standards Action
BGP Graceful Restart Flags for Address Family	RFC 4724 RFC 8538	Standards Action
BGP Layer 2 Encapsulation Types	RFC 6624	0-127: Expert Review 128-251: First Come First Served 252-255: Experimental Use
BGP Layer 2 TLV Types	RFC 6624	0-127: Expert Review 128-251: First Come First Served 252-255: Experimental Use
BGP MCAST-VPN Route Types	RFC 7441 RFC 6514	Standards Action
BGP Message Types	RFC 4271	Standards Action
BGP Non-Transitive Extended Community Types	RFC 7153	0x40-0x7f: First Come First Served 0xc0-0xcf: Reserved for Experimental Use 0xd0-0xff: Standards Action
BGP OPEN Optional Parameter Types	RFC 5492	IETF Review
BGP Outbound Route Filtering (ORF) Types	RFC 5291	0-63: Standards Action 64-127: First Come First Served 128-255: Vendor-Specific
BGP Path Attributes	RFC 4271	Standards Action
BGP Prefix-SID Label-Index TLV Flags	RFC 8669	Expert Review (Expert: Acee Lindem, Hannes Gredler)
BGP Prefix-SID Originator SRGB TLV Flags	RFC 8669	Expert Review (Expert: Acee Lindem, Hannes Gredler)
BGP Prefix-SID TLV Types	RFC 8669	Expert Review (Expert: Acee Lindem, Hannes Gredler)
BGP Role Value	RFC 9234	IETF Review
BGP Route Refresh Subcodes	RFC 7313	0-127: Standards Action 128-254: First Come First Served
BGP SRv6 Service SID Flags	RFC 9252	IETF Review
BGP Transitive Extended Community Types	RFC 7153 RFC 9184	0x00-0x3f: First Come First Served 0x80-0x82: First Come First Served 0x83-0x8f: Reserved for Experimental Use 0x90-0xbf: Standards Action
BGP Well-known Communities	RFC 1997 RFC 8642	0x00000000-0x0000FFFF: Reserved 0x00010000-0xFFFEFFFF: Private Use 0xFFFF0000-0xFFFF8000: First Come First Served 0xFFFF8001-0xFFFFFFFF: Standards Action
Capability Codes	RFC 5492 RFC 8810	1-63: IETF Review 64-238: First Come First Served 239-254: Experimental Use
Context-Specific Label Space ID Type	RFC 9573	First Come First Served
DF Alg	RFC 8584	RFC Required
DF Election Capabilities	RFC 8584	RFC Required
E-Tree Flags	RFC 8317	RFC Required
EVPN ESI Label Extended Community Flags	RFC 9746	IETF Review
EVPN Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
EVPN Layer 2 Attributes Control Flags	RFC 8214	RFC Required
EVPN Link Bandwidth Value Units	draft-ietf-bess-evpn-unequal-lb-35	RFC Required
Generic Transitive Extended Community Part 2 Sub-Types	RFC 8955 RFC 9184	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Generic Transitive Extended Community Part 3 Sub-Types	RFC 8955 RFC 9184	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Generic Transitive Extended Community Sub-Types	RFC 7153 RFC 9184	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Layer2 Info Extended Community Control Flags Bit Vector	RFC 8395	IETF Review
Long-Lived Graceful Restart Flags for Address Family	RFC 9494	Standards Action
Multicast Flags Extended Community	RFC 9251	First Come First Served
Multihoming Redundancy Mode	RFC 9746	IETF Review
Non-Transitive Four-Octet AS-Specific Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Non-Transitive IPv4-Address-Specific Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Non-Transitive IPv6-Address-Specific Extended Community Types	RFC 7153	First Come First Served
Non-Transitive Opaque Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Non-Transitive Transport Class Extended Community Sub-Types	RFC 9832	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Non-Transitive Two-Octet AS-Specific Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
P-Multicast Service Interface (PMSI) Tunnel Attribute Flags	RFC 7902	Standards Action
P-Multicast Service Interface Tunnel (PMSI Tunnel) Tunnel Types	RFC 7385 RFC 8317	0x00-0x7A: IETF Review 0x7B-0x7E: Experimental Use 0x80-0xFA: Composite Tunnel 0xFB-0xFE: Experimental Use 0xFF: Standards Action
Region Identifiers ()	RFC 4384	Not defined
SFC Extended Community Sub-Types	RFC 9015	First Come First Served
SFC SPI/SI Representation Flags	RFC 9015	Standards Action
SFP Association Type	RFC 9015	First Come First Served
SFP Attribute TLVs	RFC 9015	First Come First Served
Split-Horizon Type	RFC 9746	IETF Review
SRv6 Service Data Sub-Sub-TLV Types	RFC 9252	0-127: IETF Review 128-254: First Come First Served 255: IETF Review
SRv6 Service Sub-TLV Types	RFC 9252	0-127: IETF Review 128-254: First Come First Served 255: IETF Review
Traffic Action Fields	RFC 8955	IETF Review
Transitive Four-Octet AS-Specific Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Transitive IPv4-Address-Specific Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Transitive IPv6-Address-Specific Extended Community Types	RFC 7153	First Come First Served
Transitive Opaque Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Transitive Transport Class Extended Community Sub-Types	RFC 9832	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Transitive Two-Octet AS-Specific Extended Community Sub-Types	RFC 7153	0x00-0xbf: First Come First Served 0xc0-0xff: IETF Review
Border Gateway Protocol (BGP) Tunnel Encapsulation
BGP Tunnel Encapsulation Attribute Sub-TLVs	RFC 9012	1-63: Standards Action 64-125: First Come First Served 126-127: Experimental Use 128-191: Standards Action 192-252: First Come First Served 253-254: Experimental Use
BGP Tunnel Encapsulation Attribute Tunnel Types	RFC 9012	First Come First Served
Color Extended Community Color-Only Types	RFC 9830	Standards Action
Color Extended Community Flags	RFC 9012	Standards Action
Embedded Label Handling Sub-TLVs	RFC 9012	Standards Action
Flags Field of NVGRE Encapsulation Sub-TLVs	RFC 9012	Standards Action
Flags Field of VXLAN Encapsulation Sub-TLVs	RFC 9012	Standards Action
SR Policy Binding SID Flags	RFC 9830	Standards Action
SR Policy Segment Flags	RFC 9830	IETF Review
SR Policy Segment List Sub-TLVs	RFC 9830	IETF Review
SR Policy SRv6 Binding SID Flags	RFC 9830	Standards Action
Border Gateway Protocol - Link State (BGP-LS) Parameters
BGP-LS IGP Prefix Flags	RFC 9552	Expert Review (Expert: Adrian Farrel, Hannes Gredler)
BGP-LS MPLS Protocol Mask	RFC 9552	Expert Review (Expert: Adrian Farrel, Hannes Gredler)
BGP-LS NLRI and Attribute TLVs	RFC 9552	0-255: Reserved (not to be allocated) 256-64999: Expert Review 65000-65535: Private Use
BGP-LS NLRI Types	RFC 9552	1-64999: Expert Review 65000-65535: Private Use
BGP-LS Node Flags	RFC 9552	Expert Review (Expert: Adrian Farrel, Hannes Gredler)
BGP-LS Protocol-IDs	RFC 9552	1-199: Expert Review 200-255: Private Use
BGP-LS SR Policy Metric Types	RFC 9857	Expert Review (Expert: Stephane Litkowski, Jie Dong)
BGP-LS SR Segment Descriptor Types	RFC 9857	Expert Review (Expert: Matthew Bocci, Zafar Ali)
BGP-LS Well-Known Instance-IDs (OBSOLETE)	RFC 9552	Registry closed
SRv6 BGP EPE SID Flags	RFC 9514	Standards Action
BPF Instructions
BPF Instruction Conformance Groups	RFC 9669	Permanent: Standards Action or IESG Approval Provisional: Specification Required Historical: Specification Required
BPF Instruction Set	RFC 9669	Permanent: Standards Action or IESG Approval Provisional: Specification Required Historical: Specification Required
Building Blocks
Building Blocks	RFC 3048	Specification Required (Expert: Unassigned)
Bundle Protocol
Block Processing Control Flags	RFC 6255 RFC 9171	Specification Required (Expert: Scott Burleigh, Fred Templin)
BPSec BCB-AES-GCM AAD Scope Flags	RFC 9173	Specification Required (Expert: Ken McKeever, Edward Birrane)
BPSec BIB-HMAC-SHA2 Integrity Scope Flags	RFC 9173	Specification Required (Expert: Ken McKeever, Edward Birrane)
BPSec Security Context Identifiers	RFC 9172	Specification Required (Expert: Ken McKeever, Edward Birrane)
Bundle Administrative Record Types	RFC 7116 RFC 9713	Specification Required (Expert: Marc Blanchet, Keith Scott)
Bundle Block Types	RFC 6255 RFC 9171	Specification Required (Expert: Scott Burleigh, Fred Templin)
Bundle Custody Signal Reason Codes	RFC 6255	Specification Required (Expert: Scott Burleigh, Fred Templin)
Bundle Metadata Type Codes	RFC 6258	Specification Required (Expert: Rick Taylor)
Bundle Processing Control Flags	RFC 6255 RFC 9171	Specification Required (Expert: Scott Burleigh, Fred Templin)
Bundle Protocol TCP Convergence-Layer Message Types	RFC 7242	RFC Required
Bundle Protocol TCP Convergence-Layer REFUSE_BUNDLE Reason Codes	RFC 7242	RFC Required
Bundle Protocol TCP Convergence-Layer SHUTDOWN Reason Codes	RFC 7242	RFC Required
Bundle Protocol TCP Convergence-Layer Version 4 Message Types	RFC 9174	RFC Required
Bundle Protocol TCP Convergence-Layer Version 4 MSG_REJECT Reason Codes	RFC 9174	Specification Required (Expert: Brian Sipos, Rick Taylor)
Bundle Protocol TCP Convergence-Layer Version 4 SESS_TERM Reason Codes	RFC 9174	Specification Required (Expert: Brian Sipos, Rick Taylor)
Bundle Protocol TCP Convergence-Layer Version 4 Session Extension Types	RFC 9174	Expert Review (Expert: Brian Sipos, Rick Taylor)
Bundle Protocol TCP Convergence-Layer Version 4 Transfer Extension Types	RFC 9174	Expert Review (Expert: Brian Sipos, Rick Taylor)
Bundle Protocol TCP Convergence-Layer Version 4 XFER_REFUSE Reason Codes	RFC 9174	Specification Required (Expert: Brian Sipos, Rick Taylor)
Bundle Protocol TCP Convergence-Layer Version Numbers	RFC 7242	RFC Required
Bundle Protocol URI Scheme Types	RFC 9171	Standards Action
Bundle Status Report Flags	RFC 6255	RFC Required
Bundle Status Report Reason Codes	RFC 6255 RFC 9171	Specification Required (Expert: Scott Burleigh, Fred Templin)
CBHE Service Numbers	RFC 7116	0-63: Specification Required 1024-65535: Specification Required
Ciphersuite Flags	RFC 6257	Specification Required (Expert: Stephen Farrell, Edward Birrane)
Ciphersuite Numbers	RFC 6257	Specification Required (Expert: Stephen Farrell, Edward Birrane)
Ciphersuite Parameters and Results Type Registry	RFC 6257	Specification Required (Expert: Stephen Farrell, Edward Birrane)
Primary Bundle Protocol Version	RFC 6255	RFC Required
C-DNS DNS Capture Format
C-DNS Address Event Types	RFC 8618	Expert Review (Expert: Jim Hague, Sara Dickinson, John Dickinson)
C-DNS Response Flags	RFC 8618	Expert Review (Expert: Jim Hague, Sara Dickinson, John Dickinson)
C-DNS Storage Flags	RFC 8618	Expert Review (Expert: Jim Hague, Sara Dickinson, John Dickinson)
C-DNS Transports	RFC 8618	Expert Review (Expert: Jim Hague, Sara Dickinson, John Dickinson)
Caller-ID Numbering Plans
Caller-ID Numbering Plans Tokens	RFC 3939	Standards Action
Candidate Access Router Discovery (CARD) Parameters
AVP Type Registry	RFC 4065	Expert Review (Expert: Unassigned)
Experimental Mobility Protocol Subtype Registry	RFC 4065	Specification Required and IESG Review (Expert: Unassigned)
Layer 2 Access Technology Identifier Registry	RFC 4065	Specification Required (Expert: Unassigned)
Captive Portals
Captive Portal API Keys	RFC 8908	Specification Required (Expert: Tommy Pauly, Darshak Thakore, Martin Thomson)
CBOR Object Signing and Encryption (COSE)
COSE Algorithms	RFC 9053 RFC 9054 RFC 9864	Integers less than -65536: Private Use Integer values from -65536 to -257: Specification Required Integer values between -256 and 255: Standards Action With Expert Review Integer values from 256 to 65535: Specification Required Integer values greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
COSE Elliptic Curves	RFC 9053	Integers less than -65536: Private Use Integer values -65536 to -257: Specification Required Integer values -256 to 255: Standards Action With Expert Review Integer values 256 to 65535: Specification Required Integer values greater than 65535: Expert Review
COSE Header Algorithm Parameters	RFC 9053	Expert Review (Expert: Göran Selander, Derek Atkins, Sean Turner)
COSE Header Parameters	RFC 9052	Integers less than -65536: Private Use Integer values in the range -1 to -65536: delegated to the COSE Header Algorithm Parameters registry Integer values between 1 and 255: Standards Action With Expert Review Integer values from 256 to 65535: Specification Required Integer values greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
COSE Key Common Parameters	RFC 9052	Integers less than -65536: Private Use Integer values in the range -65536 to -1: used for key parameters specific to a single algorithm delegated to the COSE Key Type Parameters registry Integer values between 0 and 255: Standards Action With Expert Review Integer values from 256 to 65535: Specification Required Integer values greater than 65535: Expert Review Strings of length 1: Standards Action With Expert Review Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
COSE Key Type Parameters	RFC 9053	Expert Review (Expert: Göran Selander, Derek Atkins, Sean Turner)
COSE Key Types	RFC 9053	Expert Review (Expert: Göran Selander, Derek Atkins, Sean Turner)
COSE Verifiable Data Structure Algorithms	draft-ietf-cose-merkle-tree-proofs-18	Specification Required (Expert: Mike Jones, Orie Steele)
COSE Verifiable Data Structure Proofs	draft-ietf-cose-merkle-tree-proofs-18	Specification Required (Expert: Mike Jones, Orie Steele)
CBOR Web Token (CWT) Claims
CBOR Web Token (CWT) Claims	RFC 8392	Integer values from -256 to 255: Standards Action Integer values from -65536 to -257: Specification Required Integer values from 256 to 65535: Specification Required Integer values greater than 65535: Expert Review Strings of length 1: Standards Action Strings of length 2: Specification Required Strings of length greater than 2: Expert Review
CWT Confirmation Methods	RFC 8747	Specification Required (Expert: Ludwig Seitz, Mike Jones)
Centralized Conferencing Manipulation Protocol (CCMP) Parameters
CCMP Message Types	RFC 6503	Specification Required (Expert: Unassigned)
CCMP Response Codes	RFC 6503	Specification Required (Expert: Unassigned)
CERT RR Certificate Types
CERT RR Certificate Types	RFC 4398	0x0000-0x00FF: Standards Action 0xFF00-0xFFFF: Standards Action 0x0100-0xFEFF: IETF Review
Certificate Management Protocol (CMP)
CMP Well-Known URI Path Segments	RFC 9811	Specification Required (Expert: Hendrik Brockhaus, David von Oheimb, John Gray)
Channel-Binding Types
Channel-Binding Types	RFC 5056	Expert Review (Expert: Nicolas Williams)
Character Sets
Character Set Registrations	RFC 2978	Expert Review (Expert: Martin Dürst)
Character Sets	RFC 2978	Expert Review (Expert: Martin Dürst)
Character Sets Mailing List Information	RFC 2978	Expert Review
Cisco Service Level Assurance Protocol
Cisco SLA Protocol Address Family Registry	RFC 6812	Specification Required (Expert: Unassigned)
Cisco SLA Protocol Authenticator Modes Registry	RFC 6812	RFC Required
Cisco SLA Protocol CSLD Command Registry	RFC 6812	RFC Required
Cisco SLA Protocol Measurement-Type Registry	RFC 6812	RFC Required
Cisco SLA Protocol Roles Registry	RFC 6812	RFC Required
Cisco SLA Protocol Status Types Registry	RFC 6812	First Come First Served
Cisco SLA Protocol Version Number Registry	RFC 6812	RFC Required
CoAP-EAP
CoAP-EAP Cipher Suites	RFC 9820	-65536..-25: Specification Required -24..-21: Private Use -20..23: Standards Action with Expert Review 24..65535: Specification Required
CoAP-EAP Information Elements	RFC 9820	0-23: Standards Action with Expert Review 24-49: Private Use 50-65000: Specification Required 65001-65535: Experimental Use
Common Architecture Label IPv6 Security Option (CALIPSO)
CALIPSO Domain of Interpretation (DOI)	RFC 5570	1:0:0:0 - 254:255:255:255: Expert Review 255:0:0:0 - 255:255:255:255: IESG Approval
Common Name Resolution Protocol (CNRP) Parameters
Properties	RFC 3367	First Come First Served
Property Types	RFC 3367	First Come First Served
Status Messages	RFC 3367	First Come First Served
Common Open Policy Service (COPS) Protocol
A-types	RFC 3182	0-127: IETF Review 128-255: Private Use
ADMISSION_PRI (P-Type 0x05) Error Codes	RFC 6401	0-127: IETF Review 128-240: First Come First Served
C-Num and C-Type Values	RFC 2748	IETF Review
Client Types Values	RFC 2748
Client-type = 0 Flags and Error-SubCodes	RFC 4261	IETF Review
COPS-PR Object S-Num, S-Types, and Error-Codes	RFC 3084	IETF Review
M-Types, Reason Sub-Codes, and Error Sub-codes	RFC 2748	Values are assigned relative to the respective Client-type
Merge Strategies	RFC 6401	0-127: IETF Review 128-240: First Come First Served
P-types	RFC 2750	0-49151: IETF Review 49152-53247: First Come First Served 53248-65535: Reserved for Private Use
R-Types, Reason-Codes, Report-Types, Decision Object Command-Codes/Flags, and Error-Codes	RFC 2748	IETF Review
Receiver Proxy Control Policy Element (P-Type 0x07) Control-Value field	RFC 5946	0-127: IETF Review 128-240: First Come First Served
Common Presence and Instant Messaging (CPIM) Headers
CPIM Headers	RFC 3862	Standards Action
Concise Binary Object Representation (CBOR)
CBOR Simple Values	RFC 8949	0-19: Standards Action 32-255: Specification Required
CBOR Tags	RFC 8949	0-23: Standards Action 24-32767: Specification Required 32768-18446744073709551615: First Come First Served
Time Tag Map Keys	RFC 9581	Specification Required (Expert: Henk Birkholz, Esko Dijk)
Timescales	RFC 9581	RFC and Expert Review Required (Expert: Henk Birkholz, Esko Dijk)
Concise Data Definition Language (CDDL)
CDDL Control Operators	RFC 8610	name includes internal dot: IETF Review name does not include internal dot: Specification Required
Concise Software Identifier (CoSWID)
CoSWID Items	RFC 9393	0-32767: Standards Action with Expert Review 32768-4294967295: Specification Required
Connectivity Fault Management (CFM) OAM IETF Parameters
CFM OAM IETF OpCodes	RFC 7319	Standards Action
CFM OAM IETF TLV Types	RFC 7319	Standards Action
Constrained RESTful Environments (CoRE) Parameters
CoAP Codes	RFC 7252	Reserved ranges may be allocated in accordance with section 4.3 of RFC 8126.
CoAP Content-Formats	RFC 7252 RFC 9876	0-255: Expert Review 256-9999: IETF Review with Expert Review or IESG Approval with Expert Review 10000-19999: Expert Review 20000-32999: First Come First Served 33000-64997: Expert Review 64998-64999: Reserved for Documentation 65000-65535: Experimental Use
CoAP Option Numbers	RFC 7252	0-255: IETF Review or IESG Approval 256-2047: Specification Required 2048-64999: Expert Review 65000-65535: Experimental use (no operational use)
CoAP Signaling Codes	RFC 8323	IETF Review or IESG Approval
CoAP Signaling Option Numbers	RFC 8323	0-255: IETF Review or IESG Approval 256-2047: Specification Required 2048-64999: Expert Review 65000-65535: Experimental use (no operational use)
Custom Problem Detail Keys	RFC 9290	Expert Review (Expert: Thomas Fossati, Carsten Bormann)
Endpoint Type (et=) RD Parameter Values	RFC 9176	value starts with "core": IETF Review all other values: Specification Required
Interface Description (if=) Link Target Attribute Values	RFC 6690	value starts with "core": IETF Review all other values: Specification Required
OSCORE Flag Bits	RFC 8613	Expert Review (Expert: Francesca Palombini, Göran Selander, Christian Amsüss)
RD Parameters	RFC 9176	Expert Review (Expert: Carsten Bormann, Jaime Jiménez, Christian Amsüss)
Resource Type (rt=) Link Target Attribute Values	RFC 6690	value starts with "core": IETF Review all other values: Specification Required
Standard Problem Detail Keys	RFC 9290	Specification Required (Expert: Thomas Fossati, Carsten Bormann)
Target Attributes	RFC 9423	Expert Review (Expert: Carsten Bormann, Marco Tiloca)
Content Delivery Network Interconnection (CDNI) Parameters
CDNI Capabilities Redirection Modes	RFC 8008	IETF Review
CDNI Capacity Limit Types	RFC 9808	Specification Required (Expert: Ben Rosenblum, Sanjay Mishra)
CDNI CI/T Error Codes	RFC 8007	Specification Required (Expert: Kevin Ma, Sanjay Mishra)
CDNI CI/T Trigger Types	RFC 8007	RFC Required
CDNI Logging Directive Names	RFC 7937	Specification Required (Expert: Kevin Ma)
CDNI Logging Field Names	RFC 7937	Specification Required (Expert: Kevin Ma)
CDNI Logging File Version	RFC 7937	Specification Required (Expert: Kevin Ma)
CDNI Logging Record-Types	RFC 7937	Specification Required (Expert: Kevin Ma)
CDNI Metadata Footprint Types	RFC 8006	Specification Required (Expert: Kevin Ma)
CDNI Metadata Protocol Types	RFC 8006	Specification Required (Expert: Kevin Ma)
CDNI Payload Types	RFC 7736	Specification Required (Expert: Kevin Ma, Sanjay Mishra)
CDNI RI Error Response Code	RFC 7975	Specification Required (Expert: Kevin Ma, Sanjay Mishra)
CDNI Telemetry Source Types	RFC 9808	Specification Required (Expert: Ben Rosenblum, Sanjay Mishra)
CDNI URI Signing Signed Token Transport	RFC 9246	Specification Required (Expert: Phil Sorber)
CDNI URI Signing Verification Codes	RFC 9246	Specification Required (Expert: Phil Sorber)
Content Disposition Values and Parameters
Content Disposition Parameters	RFC 2183	First Come First Served
Content Disposition Values	RFC 2183	Standards Track or IESG-Approved Experimental RFC
Handling Parameter Values	RFC 3204	Not Defined
Voice Parameter Values	RFC 2421	Not Defined
Content Security Policy Directives
Content Security Policy Directives	RFC 7762	Specification Required (Expert: Mike West)
Content-Centric Networking (CCNx)
CCNx Echo Reply Codes	RFC 9508	Specification Required (Expert: Dave Oran, Hitoshi Asaeda)
CCNx Hash Function Types	RFC 8609	Specification Required (Expert: Dave Oran, Hitoshi Asaeda)
CCNx Hop-by-Hop Types	RFC 8609	RFC Required
CCNx Interest Return Code Types	RFC 8609	Specification Required (Expert: Dave Oran, Hitoshi Asaeda)
CCNx Message Types	RFC 8609	RFC Required
CCNx Name Segment Types	RFC 8609	Specification Required (Expert: Dave Oran, Hitoshi Asaeda)
CCNx Packet Types	RFC 8609	RFC Required
CCNx Payload Types	RFC 8609	Specification Required (Expert: Dave Oran, Hitoshi Asaeda)
CCNx Reply Types	RFC 9344	RFC Required
CCNx Top-Level Types	RFC 8609	RFC Required
CCNx Validation Algorithm Types	RFC 8609	Specification Required (Expert: Dave Oran, Hitoshi Asaeda)
CCNx Validation-Dependent Data Types	RFC 8609	RFC Required
Context labels for Internet Messages
Internet Message Content Types	RFC 3458	RFC Required
Context Transfer Protocol (CXTP) Parameters
Context Transfer Profile Type Registry	RFC 4065	Expert Review (Expert: Unassigned)
Context Transfer Protocol Authorization Token Calculation Algorithms	RFC 4065	Expert Review (Expert: Unassigned)
Control And Provisioning of Wireless Access Points (CAPWAP) Parameters
AC DTLS Policy	RFC 5415	Standards Action
AC Information Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
AC Security Types	RFC 5415	Standards Action
Alternate Tunnel Sub-elements	RFC 8350	Expert Review (Expert: Sri Gundavelli, Li Xue)
Alternate Tunnel-Types	RFC 8350	Specification Required (Expert: Sri Gundavelli, Li Xue)
CAPWAP Control Message Flags	RFC 5415	Expert Review (Expert: Margaret Cullen)
CAPWAP Header Flags	RFC 5415	Expert Review (Expert: Margaret Cullen)
CAPWAP IEEE 802.11 Message Types	RFC 5416	Expert Review (Expert: Margaret Cullen)
CAPWAP Message Element Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
CAPWAP Message Types	RFC 5415	Expert Review (Expert: Margaret Cullen)
CAPWAP Transport Protocol Types	RFC 5415	Expert Review (Expert: Margaret Cullen)
CAPWAP Wireless Binding Identifier	RFC 5415	Expert Review (Expert: Margaret Cullen)
Data Transfer Mode	RFC 5415	Expert Review (Expert: Margaret Cullen)
Data Transfer Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
Discovery Types	RFC 5415	Expert Review (Expert: Margaret Cullen)
ECN Support	RFC 5415	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 Antenna Combiner	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 Antenna Selection	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 Auth Type	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 Encryption Capabilities	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 Key Status	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 QoS	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 Session Key Flags	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 Split MAC Profile	RFC 7494	Expert Review (Expert: Unassigned)
IEEE 802.11 Tagging Policy	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 WTP Radio Fail	RFC 5416	Expert Review (Expert: Margaret Cullen)
IEEE 802.11 WTP Radio Type	RFC 5416	Expert Review (Expert: Margaret Cullen)
Radio Admin State	RFC 5415	Expert Review (Expert: Margaret Cullen)
Radio Failure Causes	RFC 5415	Expert Review (Expert: Margaret Cullen)
Radio Operational State	RFC 5415	Expert Review (Expert: Margaret Cullen)
Result Code	RFC 5415	Expert Review (Expert: Margaret Cullen)
Returned Message Element Reason	RFC 5415	Expert Review (Expert: Margaret Cullen)
WTP Board Data Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
WTP Descriptor Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
WTP Fallback Mode	RFC 5415	Expert Review (Expert: Margaret Cullen)
WTP Frame Tunnel Mode	RFC 5415	Expert Review (Expert: Margaret Cullen)
WTP MAC Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
WTP Radio Stats Failure Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
WTP Reboot Stats Failure Type	RFC 5415	Expert Review (Expert: Margaret Cullen)
ControLling mUltiple streams for tElepresence (CLUE)
CLUE Message Types	RFC 8847	Specification Required (Expert: Simon Pietro Romano)
CLUE Response Codes	RFC 8847	Specification Required (Expert: Simon Pietro Romano)
CLUE Schema	RFC 8846	Expert Review (Expert: Simon Pietro Romano)
CLUE Schema	RFC 8846	Expert Review (Expert: Simon Pietro Romano)
CLUE Schema	RFC 8846	Expert Review (Expert: Simon Pietro Romano)
CLUE Schema	RFC 8846	Expert Review (Expert: Simon Pietro Romano)
Cryptographic Suites for IKEv1, IKEv2, and IPsec
Cryptographic Suites for IKEv1, IKEv2, and IPsec	RFC 4308	Expert Review and RFC Required (Expert: Tero Kivinen)
Cryptographically Generated Addresses (CGA) Message Type Name Space
CGA Extension Type Tags	RFC 3972 RFC 9374	First Come First Served
CGA Extension Type Values	RFC 4581	Standards Action
CGA SEC	RFC 4982	Standards Action
Data Channel Establishment Protocol (DCEP) Parameters
Channel Types	RFC 8832	RFC Required
Message Types	RFC 8832	RFC Required
Data Link Switching Client Access Protocol (DCAP) Parameters
Data Link Switching Protocol Frame Codes	RFC 2114	RFC Required
Data Link Switching Protocol Sender Capability Codes	RFC 2114	RFC Required
Data Structure for the Security Suitability of Cryptographic Algorithms (DSSC)
Cryptographic Algorithms	RFC 5698	First Come First Served
Parameter Definitions	RFC 5698	RFC Required
Datagram Congestion Control Protocol (DCCP) Parameters
Ack Vector States	RFC 4340	Standards Action
CCID2-specific Feature Numbers (128-255)	RFC 4341	Standards Action
CCID2-specific Option Types (128-255)	RFC 4341	Standards Action
CCID2-specific Reset codes (128-255)	RFC 4341	Standards Action
CCID3-specific Feature Numbers (128-255)	RFC 4342	Standards Action
CCID3-specific Option Types (128-255)	RFC 4342	Standards Action
CCID3-specific Reset codes (128-255)	RFC 4342	Standards Action
CCID4-specific Feature Numbers (128-255)	RFC 5622	Standards Action
CCID4-specific Option Types (128-255)	RFC 5622	Standards Action
CCID4-specific Reset codes (128-255)	RFC 5622	Standards Action
Congestion Control Identifiers	RFC 4340	0-1: IETF Review (IETF RFC publication) 4-247: IETF Review (IETF RFC publication) 248-254: Reserved 255: IETF Review (IETF RFC publication)
Drop Codes	RFC 4340	Standards Action
Feature Numbers	RFC 4340	10-119: IETF Review (IETF RFC publication) 120-126: Reserved 127: IETF Review (IETF RFC publication) 128-255: CCID-specific codes
MP-DCCP Versions	RFC 9897	RFC Required
Multipath Key Type	RFC 9897	RFC Required
Multipath Options	RFC 9897	RFC Required
Option Types	RFC 4340	3-30: IETF Review (IETF RFC publication) 45-119: IETF Review (IETF RFC publication) 120-126: Reserved 127: IETF Review (IETF RFC publication) 128-255: CCID-specific codes
Packet Types	RFC 4340	Standards Action
Reset Codes	RFC 4340	12-119: IETF Review (IETF RFC publication) 120-126: Reserved 127: IETF Review (IETF RFC publication) 128-255: CCID-specific codes
Service Codes	RFC 4340	Specification Required or First Come First Served (Expert: Eddie Kohler)
Datagram Transport Layer Security (DTLS) Extension to Establish Keys for Secure Real-time Transport Protocol (SRTP)
DTLS-SRTP Protection Profiles	RFC 5764	Specification Required (Expert: Unassigned)
Delivery Status Notification (DSN) Types
Address Types	RFC 3461 RFC 3464	RFC Required
Diagnostic Types	RFC 3461 RFC 3464	RFC Required
MTA Name Types	RFC 3461 RFC 3464	RFC Required
DetNet Associated Channel Header (d-ACH) Flags
DetNet Associated Channel Header (d-ACH) Flags	RFC 9546	IETF Review
Device Identification
DEV URN Subtypes	RFC 9039	Specification Required or IESG Approval (Expert: Jari Arkko, Jaime Jimenez)
Differentiated Services Field Codepoints (DSCP)
Differentiated Services Field Codepoints (DSCP)	RFC 2474 RFC 3260
ECN Field (Bits 6-7)	RFC 3168	RFC Required
Directory System Names
Distinguished Names	RFC 1779	Closed see RFC 4520
Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel
DOTS Signal Channel Attack Status Codes	RFC 9132	Standards Action
DOTS Signal Channel CBOR Key Values	RFC 9132	1-127: IETF Review 128-255: IETF Review 256-16383: IETF Review 16384-32767: Specification Required 32768-49151: IETF Review 49152-65535: Private Use
DOTS Signal Channel Conflict Cause Codes	RFC 9132	Standards Action
DOTS Signal Channel Conflict Status Codes	RFC 9132	Standards Action
DOTS Signal Channel Status Codes	RFC 9132	Standards Action
Distributed Node Consensus Protocol (DNCP)
DNCP TLV Types	RFC 7787	Standards Action
HNCP TLV Types	RFC 7788	RFC Required
DNS-Based Authentication of Named Entities (DANE) Parameters
TLSA Certificate Usages	RFC 6698 RFC 7218	RFC Required
TLSA Matching Types	RFC 6698 RFC 7218	Specification Required (Expert: Unassigned)
TLSA Selectors	RFC 6698 RFC 7218	Specification Required (Expert: Viktor Dukhovni, Shumon Huque, Paul Wouters)
Domain Name System (DNS) Parameters
AFSDB RR Subtype	RFC 6895 RFC 1035	Registry closed per RFC 6895
AMTRELAY Relay Type Field	RFC 8777	Specification Required (Expert: Unassigned)
Child Synchronization (CSYNC) Flags	RFC 7477	Standards Action
DHCID RR Digest Type Codes	RFC 4701	Standards Action
DHCID RR Identifier Type Codes	RFC 4701	Standards Action (Expert: Ólafur Guðmundsson)
DNS Catalog Zones Properties	RFC 9432	property prefix ends in the label "ext": Private Use all other property prefixes: Expert Review
DNS CLASSes	RFC 6895 RFC 9108	0: Standards Action 1-127: IETF Review 128-253: IETF Review 256-32767: IETF Review 32768-57343: Specification Required 57344-65279: Specification Required 65280-65534: Private Use 65535: Standards Action
DNS EDNS0 Option Codes (OPT)	RFC 6891	1-65000: Expert Review 65001-65534: Local/Experimental Use
DNS Header Flags	RFC 6895 RFC 1035	Standards Action
DNS KEY RR Protocol Octet Values	RFC 4034 RFC 2535	CLOSED per RFC 3445
DNS Label Types	RFC 6891	Standards Action
DNS OpCodes	RFC 6895 RFC 1035	Standards Action
DNS RCODEs	RFC 6895 RFC 1035	0-3840: IETF Review 3841-4095: Private Use 4096-65534: IETF Review 65535: Reserved (Standards Action)
DNS Resolver Information Keys	RFC 9606	Specification Required (Expert: Tirumal Reddy, Mohamed Boucadair, Ben Schwartz)
DNS Server Cookie Methods	RFC 9018 RFC 7873	Version 1-239, Size 8-32: Expert Review Version 240-254, Size 8-32: Private Use
DNS SVCB Service Parameter Keys (SvcParamKeys)	RFC 9460	0-65279: Expert Review 65280-65534: Private Use
DNS-over-QUIC Error Codes	RFC 9250	provisional (greater than 0x3f): Expert Review provisional registration Date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required
DNSKEY RR Flags	RFC 3755 RFC 4034	Standards Action
DSO Type Codes	RFC 8490	0x0004-0x003F: Standards Action 0x0040-0xF7FF: Expert Review 0xF800-0xFBFF: Experimental/Local Use 0xFC00-0xFFFF: Standards Action
DSYNC: Location of Synchronization Endpoints	RFC 9859	Expert Review (Expert: Johan Stenstam, Peter Thomassen, John Levine)
EDNS Header Flags (16 bits)	RFC 6891	Standards Action
EDNS version Number (8 bits)	RFC 6891	Standards Action
Extended DNS Error Codes	RFC 8914	0-49151: First Come First Served 49152-65535: Private Use
Resource Record (RR) TYPEs	RFC 6895 RFC 1035 RFC 9108	0: RRTYPE zero is used as a special indicator for the SIG RR RFC 2931, RFC 4034 and in other circumstances and must never be allocated for ordinary use. 1-127: Expert Review (see mailing list information in RFC 6895) or Standards Action 128-255: Expert Review (see mailing list information in RFC 6895) or Standards Action 256-61439: Expert Review (see mailing list information in RFC 6895) or Standards Action 61440-65279: Reserved for future use (IETF Review required to define use) 65280-65534: Private Use 65535: Reserved (Standards Action)
SSHFP RR types for fingerprint types	RFC 4255	IETF Review
SSHFP RR Types for public key algorithms	RFC 4255	IETF Review
Underscored and Globally Scoped DNS Node Names	RFC 8552	Expert Review (Expert: Frederico A C Neves, Paul Wouters)
ZONEMD Hash Algorithms	RFC 8976	1-239: Specification Required 240-254: Private Use
ZONEMD Schemes	RFC 8976	1-239: Specification Required 240-254: Private Use
ZONEVERSION TYPE Values	RFC 9660	0-245: Specification Required 246-254: Private Use 255: Reserved
Domain Name System Security (DNSSEC) Algorithm Numbers
Digest Algorithms	RFC 3658 RFC 4034 RFC 4035 RFC 9157 RFC 9904	Standards Action or Specification Required (Expert: Mark Andrews, Roy Arends, Warren Kumari, Wes Hardaker)
DNS KEY Record Diffie-Hellman Prime Lengths	RFC 2539	IETF Review
DNS KEY Record Diffie-Hellman Well-Known Prime/Generator Pairs	RFC 2539	0x0000-0x07ff: Standards Action 0x0800-0xbfff: RFC Required
DNS Security Algorithm Numbers	RFC 4034 RFC 3755 RFC 6014 RFC 6944 RFC 9904	Standards Action or Specification Required (Expert: Mark Andrews, Roy Arends, Warren Kumari, Wes Hardaker)
Domain Name System Security (DNSSEC) NextSECure3 (NSEC3) Parameters
DNSSEC NSEC3 Flags	RFC 5155 RFC 9157	RFC Required
DNSSEC NSEC3 Hash Algorithms	RFC 5155 RFC 9157	RFC Required
DNSSEC NSEC3PARAM Flags	RFC 5155 RFC 9157	RFC Required
Domain-based Message Authentication, Reporting, and Conformance (DMARC)
DMARC Report Formats	draft-ietf-dmarc-dmarcbis-41	Specification Required (Expert: Scott Kitterman)
DMARC Tags	draft-ietf-dmarc-dmarcbis-41	Specification Required (Expert: Scott Kitterman)
DomainKeys Identified Mail (DKIM) Parameters
_domainkey DNS TXT Record Tag Specifications	RFC 6376	IETF Review
Authorized Third-Party Signature (ATPS) Tag Registry	RFC 6541	Specification Required (Expert: Unassigned)
DKIM Hash Algorithms	RFC 6376	IETF Review
DKIM Key Type	RFC 6376	IETF Review
DKIM Reporting Tag Registry	RFC 6651	Specification Required (Expert: Unassigned)
DKIM Selector Flags	RFC 6376	IETF Review
DKIM Service Types	RFC 6376	IETF Review
DKIM Signature Tag Specifications	RFC 6376	IETF Review
DKIM-Signature Canonicalization Body	RFC 6376	IETF Review
DKIM-Signature Canonicalization Header	RFC 6376	IETF Review
DKIM-Signature Query Method	RFC 6376	IETF Review
Drone Remote ID Protocol
DRIP Frame Types	RFC 9575	0x01-0x9F: Expert Review 0xA0-0xEF: First Come First Served 0xF0-0xFF: Experimental Use
DRIP RAA Allocations	RFC 9886	0-3: Reserved 4-3999: IESG Approval 4000-8191: Reserved 8192-15359: First Come First Served 15360-16383: Private Use
DRIP SAM Types	RFC 9575	Standards Action
HHIT Entity Types	RFC 9886	First Come First Served
Hierarchical a HIT (HHIT) Suite IDs	RFC 9374	IETF Review
Hierarchical HIT (HHIT) Prefixes	RFC 9374	Expert Review (Expert: Adam Wiethuechter, Mohamed Boucadair)
Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) Parameters
Altitude Type Registry	RFC 6225	Standards Action
Authentication Suboption (value 8) - Algorithm identifier values	RFC 4030	IETF Review
Authentication Suboption (value 8) - Protocol identifier values	RFC 3118	IETF Review
Authentication Suboption (value 8) - Replay Detection Method (RDM) identifier values	RFC 4030	IETF Review
BOOTP Vendor Extensions and DHCP Options	RFC 2939	IETF Review
CableLabs Client Configuration Option Ticket Control Mask Bit Definitions	RFC 3594	IETF Review
Datum Registry	RFC 6225	Standards Action
DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes	RFC 3495	IETF Review
DHCP Message Type 53 Values	RFC 2939	IETF Review
DHCP Options Permitted in the RADIUS DHCPv4-Options Attribute	RFC 9445	Expert Review (Expert: Alan DeKok, Mohamed Boucadair)
DHCP Relay Agent Sub-Option Codes	RFC 3046	IETF Review
DHCP State Type 156 Values	RFC 6926	IETF Review
DHCP Status Code Type 151 Values	RFC 6926	IETF Review
GeoLoc Option Version Registry	RFC 6225	Standards Action
IEEE 802.21 Service Type (MoS DHCPv4 Address and FQDN Sub-Options)	RFC 5678	Standards Action
NetWare/IP Option Type 63 Sub-Option Codes	RFC 2242	Not defined
NTP Time Source Suboptions	RFC 5908	IETF Review
RADIUS Attributes Permitted in RADIUS Attributes DHCP Suboption	RFC 9445	Expert Review (Expert: Alan DeKok, Mohamed Boucadair)
VSS Type Options	RFC 6607	IETF Review
Dynamic Host Configuration Protocol for IPv6 (DHCPv6)
DHCPv6 Options Permitted in the RADIUS DHCPv6-Options Attribute	RFC 9445 RFC 9915	Expert Review (Expert: Alan DeKok, Mohamed Boucadair)
DUIDs	RFC 9915	Standards Action
IEEE 802.21 Service Type (MoS DHCPv6 Address and FQDN Sub-Options)	RFC 5678 RFC 9915	Standards Action
Message Types	RFC 9915	Standards Action
NTP Time Source Suboptions	RFC 5908 RFC 9915	IETF Review
Option Codes	RFC 9915	Expert Review and Standards Action (Expert: Ted Lemon, Bernie Volz, Tomek Mrugalski)
Option Codes Permitted in the S46 Priority Option	RFC 8026 RFC 9915	IETF Review
OPTION_LQ_QUERY option	RFC 5007 RFC 9915	Standards Action
Options Permitted in the Relay-Supplied Options Option	RFC 6422 RFC 9915	IETF Review
Processor Architecture Types	RFC 5970 RFC 9915	Expert Review (Expert: Vincent Zimmer, Bernie Volz, Tomek Mrugalski)
RADIUS Attributes Permitted in DHCPv6 RADIUS Option	RFC 7037 RFC 9915	Expert Review (Expert: Bernie Volz, Tomek Mrugalski)
Status Codes	RFC 9915	Standards Action
Supported Transport	RFC 9527 RFC 9915	RFC Required
VSS Type Options	RFC 6607	IETF Review
Dynamic Link Exchange Protocol (DLEP) Parameters
Data Item Type Values	RFC 8175	26-65407: Specification Required 65408-65534: Private Use
Extension Type Values	RFC 8175	2-65519: Specification Required 65520-65534: Private Use
Hop Control Actions Values	RFC 8629	4-65519: Specification Required 65520-65534: Private Use
IPv4 Address Flags	RFC 8175	Specification Required (Expert: Rick Taylor)
IPv4 Attached Subnet Flags	RFC 8175	Specification Required (Expert: Rick Taylor)
IPv4 Connection Point Flags	RFC 8175	Specification Required (Expert: Rick Taylor)
IPv6 Address Flags	RFC 8175	Specification Required (Expert: Rick Taylor)
IPv6 Attached Subnet Flags	RFC 8175	Specification Required (Expert: Rick Taylor)
IPv6 Connection Point Flags	RFC 8175	Specification Required (Expert: Rick Taylor)
Message Type Values	RFC 8175	17-65519: Specification Required 65520-65534: Private Use
Peer Type Flags	RFC 8175	Specification Required (Expert: Rick Taylor)
Queue Parameter Sub-Data Item Type Values	RFC 8651	2-65407: Specification Required 65408-65534: Private Use
Signal Type Values	RFC 8175	3-65519: Specification Required 65520-65534: Private Use
Status Code Values	RFC 8175	4-111: Specification Required 112-127: Private Use 133-239: Specification Required 240-254: Private Use
Traffic Classification Sub-Data Item Type Values	RFC 9892	1-65407: Specification Required 65408-65534: Private Use
Dynamic Source Routing (DSR) Protocol Parameters
Dynamic Source Routing (DSR) Protocol Options	RFC 4728	Expert Review (Expert: David B. Johnson, David A. Maltz, Yih-Chun Hu)
Dynamic Source Routing (DSR) Protocol Route Error Types	RFC 4728	Expert Review (Expert: David B. Johnson, David A. Maltz, Yih-Chun Hu)
Dynamic Symmetric Key Provisioning Protocol (DSKPP)
DSKPP Version Registry	RFC 6063	Standards Action
Key Container Registry	RFC 6063	Specification Required (Expert: Unassigned)
PRF Algorithm ID Registry	RFC 6063	Specification Required (Expert: Unassigned)
Status Codes	RFC 6063	Specification Required (Expert: Unassigned)
EAP-pwd Parameters
Password Preprocessing Methods	RFC 5931	Specification Required (Expert: Joseph Salowey)
PRF Registry	RFC 5931	IETF Review
PWD-Exch Messages	RFC 5931	IETF Review
Random Function Registry	RFC 5931	Specification Required (Expert: Joseph Salowey)
Electronic Commerce Modeling Language (ECML) Parameters
URN Prefix: urn:ietf:params:ecml	RFC 4112	IESG Approval
Electronic Commerce Modeling Language Version 2 (ECMLv2) Parameters
Ecom_Payment_Card_Protocol Registry	RFC 4112	Expert Approval (Expert: Donald Eastlake)
Ecom_Payment_Card_Type Registry	RFC 4112	Expert Approval (Expert: Donald Eastlake)
Ecom_Transaction_Type Registry	RFC 4112	Expert Approval (Expert: Donald Eastlake)
Email Authentication Parameters
Email Authentication Methods	RFC 8601 draft-ietf-dmarc-dmarcbis-41	Specification Required (Expert: Murray Kucherawy (primary), Scott Kitterman (secondary))
Email Authentication Property Types	RFC 8601	Expert Review (Expert: Murray Kucherawy (primary), Scott Kitterman (secondary))
Email Authentication Result Names	RFC 8601 draft-ietf-dmarc-dmarcbis-41	Specification Required (Expert: Murray Kucherawy (primary), Scott Kitterman (secondary))
Emergency Call Additional Data
Device Classification	RFC 7852	Expert Review (Expert: Brian Rosen)
Device ID Type	RFC 7852	Expert Review (Expert: Brian Rosen)
Device/Service Data Type	RFC 7852	Specification Required (Expert: Brian Rosen)
Emergency Call Data Types	RFC 7852	Specification Required (Expert: Brian Rosen (primary), Henning Schulzrinne (secondary))
Provider ID Series	RFC 7852	Expert Review (Expert: Brian Rosen)
Service Environment	RFC 7852	Expert Review (Expert: Brian Rosen)
Service Mobility	RFC 7852	Expert Review (Expert: Brian Rosen)
Service Type	RFC 7852	Expert Review (Expert: Brian Rosen)
Type of Provider	RFC 7852	Expert Review (Expert: Brian Rosen)
Emergency Call Metadata/Control Data
Emergency Call Action Failure Reasons	RFC 8147	Expert Review (Expert: Randall Gellens)
Emergency Call Actions	RFC 8147	Expert Review (Expert: Randall Gellens)
Emergency Call Static Messages	RFC 8148	Specification Required (Expert: Randall Gellens)
Emergency Call Vehicle Camera IDs	RFC 8148	Expert Review (Expert: Randall Gellens)
Emergency Call Vehicle Lamp IDs	RFC 8148	Expert Review (Expert: Randall Gellens)
Enumservice Registrations
Enumservice Registrations	RFC 6117	Specification Required (Expert: Bernie Hoeneisen)
Ephemeral Diffie-Hellman Over COSE (EDHOC)
EDHOC Authentication Credential Types	RFC 9668	less than -65536: Private Use -65536 to -25: Specification Required -24 to 23: Standards Action with Expert Review 24 to 65535: Specification Required greater than 65535: Private Use
EDHOC Cipher Suites	RFC 9528	-65536 to -25: Specification Required -24 to -21: Private Use -20 to 23: Standards Action with Expert Review 24 to 65535: Specification Required
EDHOC Error Codes	RFC 9528	-65536 to -25: Expert Review -24 to 23: Standards Action 24 to 65535: Expert Review
EDHOC Exporter Labels	RFC 9528	0-23: Standards Action 24-32767: Expert Review 32768-65535: Private Use
EDHOC External Authorization Data	RFC 9528	0-23: Standards Action with Expert Review 24-65535: Specification Required
EDHOC Method Types	RFC 9528	-65536 to -25: Specification Required -24 to 23: Standards Action with Expert Review 24 to 65535: Specification Required
ESP AGGFRAG_PAYLOAD
AGGFRAG_PAYLOAD Sub-Types	RFC 9347	Expert Review (Expert: Christian Hopps)
Ethernet VPN (EVPN)
EVPN Route Types	RFC 7432	RFC Required
Extended Master Session Key (EMSK) Parameters
EMSK PRF Numbers	RFC 5295	0-220: IETF Review 221-255: Reserved for Private Use
User Specific Root Keys (USRK) Key Labels	RFC 5295	Specification Required (Expert: Unassigned)
Extensible Authentication Protocol (EAP)
ADE Type Namespace	RFC 4746	Expert Review (Expert: Joseph Salowey)
Attribute Types (Non-Skippable Attributes 0-127)	RFC 4187	Specification Required (Expert: Vesa Lehtovirta)
Attribute Types (Skippable Attributes 128-255)	RFC 4187	Specification Required (Expert: Vesa Lehtovirta)
DH Group ID Namespace	RFC 4746	Expert Review (Expert: Unassigned)
EAP Finish/Re-auth Flags	RFC 6630	Standards Action or IESG Approval
EAP Initiate and Finish Attributes	RFC 6696	IETF Review
EAP Initiate/Re-auth Flags	RFC 6630	Standards Action or IESG Approval
EAP Initiate/Re-auth-Start Flags	RFC 6630	Standards Action or IESG Approval
EAP Lower Layers	RFC 6677	Expert Review (Expert: Joseph Salowey)
EAP Provisioning Identifiers	draft-ietf-emu-eap-arpa-10	Expert Review (Expert: Unassigned)
EAP-AKA' AT_KDF Key Derivation Function Values	RFC 9048	Specification Required (Expert: Vesa Lehtovirta)
EAP-AKA' AT_KDF_FS Key Derivation Function Values	RFC 9678	Specification Required (Expert: Jari Arkko, Peter Yee)
EAP-FAST (value 43) Error-TLV (value 5) Error-Codes	RFC 4851	Specification Required (Expert: Joseph Salowey)
EAP-FAST (value 43) Request-Action TLV (value 19) Action Codes	RFC 4851	Specification Required (Expert: Joseph Salowey)
EAP-FAST GTC Error Codes	RFC 5421	Specification Required (Expert: Joseph Salowey)
EAP-FAST PAC Attribute Types	RFC 5422	Specification Required (Expert: Joseph Salowey)
EAP-FAST PAC Types	RFC 5422	Specification Required (Expert: Joseph Salowey)
EAP-FAST Server-Trusted-Root Credential Format Types	RFC 5422	Specification Required (Expert: Joseph Salowey)
EAP-FAST TLV Types (Value 43)	RFC 4851	Specification Required (Expert: Joseph Salowey)
EAP-GPSK Ciphersuites	RFC 5433	IETF Review
EAP-GPSK Failure Codes	RFC 5433	IETF Review
EAP-GPSK OP Codes	RFC 5433	IETF Review
EAP-GPSK Protected Data Payloads	RFC 5433	IETF Review
EAP-IKEv2 Payloads	RFC 5106	Expert Review (Expert: Joseph Salowey)
EAP-NOOB Cryptosuites	RFC 9140	Specification Required (Expert: Tuomas Aura, Mohit Sethi)
EAP-NOOB Error Codes	RFC 9140	6001-6999: Private and Experimental Use All other values: Specification Required
EAP-NOOB Message Types	RFC 9140	Specification Required (Expert: Tuomas Aura, Mohit Sethi)
EAP-NOOB PeerInfo Data Fields	RFC 9140	Specification Required (Expert: Tuomas Aura, Mohit Sethi)
EAP-NOOB ServerInfo Data Fields	RFC 9140	Specification Required (Expert: Tuomas Aura, Mohit Sethi)
EAP-SAKE messages	RFC 4763	IETF Review with Specification Required (Expert: Unassigned)
EAP-TTLS AVP Usage	RFC 5281	IETF Review
Encryption Algorithms	RFC 4793	0x0003-0x7fff: Specification Required and IESG Approval 0x8000-0xffff: Vendor-specific proprietary algorithms
EXT_Type Numbers	RFC 4764	Specification Required (Expert: Joseph Salowey)
Hash Algorithms	RFC 4793	0x0006-0x7fff: Specification Required and IESG Approval 0x8000-0xffff: Proprietary vendor-specific algorithms
MAC Algorithms	RFC 4793	0x0002-0x7fff: Specification Required and IESG Approval 0x8000-0xffff: Vendor-specific proprietary algorithms
MAC ID Namespace	RFC 4746	Expert Review (Expert: Joseph Salowey)
Message Types	RFC 6696	IETF Review
Method Types	RFC 3748	1-191: Specification Required 192-253: Standards Action 254: Expanded Type 255: Experimental 256-4294967295: Specification Required
non-skippable attributes	RFC 4763	IETF Review with Specification Required (Expert: Unassigned)
Packet Codes	RFC 3748	Standards Action
Public Key ID Namespace	RFC 4746	Expert Review (Expert: Joseph Salowey)
Re-authentication Cryptosuites	RFC 6696	IETF Review
skippable attributes	RFC 4763	IETF Review
Subtypes	RFC 4187	Specification Required (Expert: Vesa Lehtovirta)
TEAP Error TLV (value 5) Error Codes	RFC 9930	Specification Required (Expert: Margaret Cullen, Nancy Cam-Winget)
TEAP Identity-Type TLV (value 2) Registry	RFC 9930	Specification Required (Expert: Unassigned)
TEAP PAC TLV (value 11) PAC Attribute Type Codes	RFC 9930	Registry closed
TEAP PAC TLV (value 11) PAC-Type Type Codes	RFC 9930	Registry closed
TEAP Request-Action TLV (value 8) Registry	RFC 9930	Specification Required (Expert: Unassigned)
TEAP Status Codes	RFC 9930	Specification Required (Expert: Unassigned)
TEAP TLV Types	RFC 9930	Specification Required (Expert: Margaret Cullen, Nancy Cam-Winget)
TEAP Trusted-Server-Root TLV (value 17) Credential-Format Codes	RFC 9930	Specification Required (Expert: Unassigned)
Trusted Non-3GPP Access EAP Parameters	RFC 7458	Specification Required (Expert: Jouni Korhonen)
Extensible Authentication Protocol (EAP) Channel-Binding Parameters
EAP Channel-Binding Codes	RFC 6677	Standards Action
EAP Channel-Binding Namespaces	RFC 6677	IETF Review
Extensible Authentication Protocol (EAP) Encrypted Key Exchange (EKE) Registry
EAP-EKE Channel-Binding Type Registry	RFC 6124	Specification Required (Expert: Joseph Salowey)
EAP-EKE Diffie-Hellman Group Registry	RFC 6124	Specification Required (Expert: Joseph Salowey)
EAP-EKE Encryption Algorithm Registry	RFC 6124	Specification Required (Expert: Joseph Salowey)
EAP-EKE Exchange Registry	RFC 6124	RFC Required
EAP-EKE Failure-Code Registry	RFC 6124	RFC Required
EAP-EKE Identity Type Registry	RFC 6124	Specification Required (Expert: Joseph Salowey)
EAP-EKE Keyed Message Digest (MAC) Registry	RFC 6124	Specification Required (Expert: Joseph Salowey)
EAP-EKE Pseudo Random Function Registry	RFC 6124	Specification Required (Expert: Joseph Salowey)
Extensible Binary Meta Language (EBML)
EBML DocTypes	RFC 8794	First Come First Served
EBML Element IDs	RFC 8794	0x80-0xFE: RFC Required 0x407F-0x7FFE: Specification Required 0x203FFF-0x3FFFFE: First Come First Served 0x101FFFFF-0x1FFFFFFE: Specification Required or First Come First Served
Extensible Markup Language (XML) Configuration Access Protocol (XCAP) Parameters
XCAP Application Unique IDs	RFC 4825	Standards Action
Extensible Provisioning Protocol (EPP) Extensions
Extensions for the Extensible Provisioning Protocol (EPP)	RFC 7451	Specification Required (Expert: Gavin Brown (primary), Alexander Mayrhofer (secondary), Ning Kong (secondary), Roger D Carney (secondary), Jim Galvin (secondary), James Gould (secondary), Scott Hollenbeck (secondary))
Extensible Provisioning Protocol (EPP) Organization Role Values
EPP Organization Role Values	RFC 8543	Expert Review (Expert: James Gould)
Extensible Provisioning Protocol (EPP) Repository Identifiers
EPP Repository Identifiers	RFC 5730	First Come First Served
FCAST Parameters
FCAST Object Metadata Encoding	RFC 6968	Expert Review (Expert: Unassigned)
FCAST Object Metadata Format	RFC 6968	Specification Required (Expert: Unassigned)
FCAST Object Metadata Types	RFC 6968	Expert Review (Expert: Unassigned)
Federated File System (FedFS) Parameters
FedFS Annotation Keys	RFC 7532	First Come First Served
FedFS Object Identifiers	RFC 7532	Registry Closed
Fibre Channel Port Types Registry
Fibre Channel Port Types	RFC 4044	1-9999: Specification Required 10000-99999: Private Use 100000 and higher: Reserved
Flow Spec Component Types
Flow Spec Component Types	RFC 8955 RFC 8956	0: Reserved 1-127: Specification Required 128-254: Expert Review 255: Reserved
FLUTE - File Delivery over Unidirectional Transport (FLUTE) Parameters
FLUTE Content Encoding Algorithms	RFC 6726	Specification Required (Expert: Unassigned)
FOOBAR Address Family Numbers
Assigned FOOBAR Address Families	RFC 1639	IANA assignment
Forwarding and Control Element Separation (ForCES)
Association Setup Response	RFC 5810	0x00000000-0x000000FF: IETF Review 0x00000100-0x0000FFFF: Specification Required
Association Teardown Message	RFC 5810	0x00000000-0x0000FFFF: IETF Review 0x00010000-0x7FFFFFFF: Specification Required
Exception ID	RFC 6956	Specification Required (Expert: Jamal Hadi Salim, Joel Halpern)
EXTENDEDRESULT-TLV Result Values	RFC 7391	Specification Required (Expert: Unassigned)
Header Flags	RFC 5810	IETF Review
Logical Functional Block (LFB) Class Names and Class Identifiers	RFC 5812 RFC 7121	0-65535: Standards Action >65535: First Come First Served with any publicly available specification
Message Types	RFC 5810	0x00-0x1F: IETF Review 0x20-0x7F: Specification Required
Metadata ID	RFC 6956	Specification Required (Expert: Jamal Hadi Salim, Joel Halpern)
Operation Selection (OPER-TLV) Types	RFC 5810	0x0000-0x00FF: IETF Review 0x0100-0x7FFF: Specification Required
RESULT-TLV Result Values	RFC 5810	Expert Review (Expert: Jamal Hadi Salim, Joel Halpern)
TLV Types	RFC 5810	0x0000-0x01FF: IETF Review 0x0200-0x7FFF: Specification Required
Validate Error ID	RFC 6956	Specification Required (Expert: Jamal Hadi Salim, Joel Halpern)
Free Lossless Audio Codec (FLAC)
FLAC Application Metadata Block IDs	RFC 9639	First Come First Served
FTP parameters
FTP Commands and Extensions	RFC 5797	registration marked "mandatory" ('m' in the "conf" column): Standards Action all other registrations: Specification Required
General Internet Signalling Transport (GIST) Parameters
Additional Information Types	RFC 5971	First Come First Served
Error Code 1 Subcodes	RFC 5971	First Come First Served
Error Code 10 Subcodes	RFC 5971	First Come First Served
Error Code 12 Subcodes	RFC 5971	First Come First Served
Error Code 9 Subcodes	RFC 5971	First Come First Served
GIST Error Codes	RFC 5971	First Come First Served
GIST MA-Protocol-IDs	RFC 5971	0-63: IETF Review 64-119: Expert Review
GIST Message Routing Methods	RFC 5971	0-63: IETF Review 64-119: Specification Required
GIST Message Types	RFC 5971	0-31: IETF Review 32-55: Expert Review
GIST Object Types	RFC 5971	0-1023: IETF Review 1024-1999: Specification Required
NSIS Signaling Layer Protocol (NSLP) Identifiers	RFC 5971	IESG Approval
Generalized Multi-Protocol Label Switching (GMPLS) Signaling Parameters
Actions	RFC 3471	IETF Review or Specification Required (Expert: Unassigned)
Administrative Status Information Flags	RFC 4783	Standards Action
Association Type	RFC 4872	Standards Action
CWDM Channel Spacing Subregistry	RFC 6205	Standards Action
DWDM Channel Spacing Subregistry	RFC 6205	Standards Action
Ethernet Bandwidth Profiles	RFC 6003	Standards Action
Ethernet Sender TSpec TLVs/Ethernet Flowspec TLVs	RFC 6003	Standards Action
Ethernet Switching Granularities	RFC 6003	Standards Action
Generalized PIDs (G-PID)	RFC 3471 RFC 4328	0-31743: Standards Action 31744-32767: Assigned Temporarily for Experimental Usage 32768-65535: Standards Action
Generalized SCSI (Switching Capability Specific Information) TLV Types	RFC 8258	Specification Required (Expert: Lou Berger, Vishnu Beeram)
Grid Subregistry	RFC 6205	Standards Action
Hierarchy Actions	RFC 6107	Standards Action
Interface_ID Types	RFC 3471	IETF Review or Specification Required (Expert: Unassigned)
LSP Encoding Types	RFC 3471 RFC 4328	0-239: Standards Action 240-255: Assigned temporarily for Experimental Usage
OTN Signal Type	RFC 7139 RFC 7892	0-255: Standards Action 0-255: Specification Required
Special Purpose Generalized Label Values	RFC 8359	Standards Action
Switching Types	RFC 3471 RFC 4328 RFC 7074	Standards Action
GeneRic Autonomic Signaling Protocol (GRASP) Parameters
GRASP Messages and Options	RFC 8990	Standards Action
GRASP Objective Names	RFC 8990	Specification Required (Expert: Michael Richardson)
Generic Routing Encapsulation (GRE) Parameters
GRE Protocol Types	RFC 2784	Need to go to IEEE
GRE Version Numbers	RFC 2784	IETF Review
Generic Security Service Application Program Interface (GSSAPI)/Kerberos/Simple Authentication and Security Layer (SASL) Service Names
GSSAPI/Kerberos/SASL Service Names	RFC 2743	Specification Required (Expert: Unassigned)
Generic Security Service Application Program Interface Parameters
GSS-API URN Parameters	RFC 7056	IETF Review or Expert Review (Expert: Unassigned)
Geolocation Policy
Geolocation Policy Location Profile Names	RFC 6772	Specification Required (Expert: Unassigned)
Geopriv HTTP Enabled Location Delivery (HELD) Parameters
HELD Error Codes	RFC 5985	Standards Action
Geopriv Identifiers
Geopriv Identifiers	RFC 7035	IETF Review
Geopriv Location Object Registries
Method Tokens	RFC 4119	First Come First Served
PIDF-LO Civic Address Considerations Registry	RFC 5774	Expert Review (Expert: Brian Rosen, Dan Banks)
XML Namespaces for 'provided-by' elements for use with PIDF-LO objects	RFC 4119	Expert Review (Expert: Primary: Allison Mankin, Secondary: Jon Peterson)
Geopriv Location Type Registries
Civic Address Types (CAtypes)	RFC 4776 RFC 6848	Type=A: IETF Review Type=B: Expert Review
Location Types	RFC 4589	Expert Review (Expert: Martin Thomson)
Relative Location Parameters	RFC 7035	IETF Review
Global Navigation Satellite System (GNSS)
Global Navigation Satellite System (GNSS) Types	RFC 7105	Specification Required (Expert: Unassigned)
Global Switch Management Protocol version 3 (GSMPv3) Adaptation Type Name Space
Adaptation Types	RFC 3292	0x000-0x2FF: IETF Review 0x300-0xFFF: First Come First Served
Global Switch Management Protocol version 3 (GSMPv3) Event Flag Name Space
Event Flags	RFC 3292	Expert Review (Expert: Stefaan De Cnodder, Avri Doria)
Global Switch Management Protocol version 3 (GSMPv3) Failure Response Message Name Space
Failure Response Message Names	RFC 3292	0-59: IETF Review 60-79: Reserved for Vendor Private Extensions 80-127: IETF Review 128-159: Reserved for Vendor Private Extensions 160-255: IETF Review
Global Switch Management Protocol version 3 (GSMPv3) Label Type Name Space
Label Type Names	RFC 3292	0x000-0xAFF: IETF Review 0xB00-0xEFF: RFC Required 0xF00-0xFFF: Reserved for vendor private use
Global Switch Management Protocol version 3 (GSMPv3) Message Type Name Space
Message Types	RFC 3292	0-99: IETF Review 100-199: RFC Required 200-249: Intended for Abstract and Resource Model Extension Messages 250-255: Reserved for vendor private use
Global Switch Management Protocol version 3 (GSMPv3) Model Type Name Space
Model Type Names	RFC 3292	0: IETF Review 1-200: RFC Required 201-255: Reserved for vendor private use
Global Switch Management Protocol version 3 (GSMPv3) Port Type Name Space
Port Type Names	RFC 3292	0-127: IETF Review 128-255: RFC Required or Specification Required
Global Switch Management Protocol version 3 (GSMPv3) Result Type Name Space
Result Type Names	RFC 3292	Expert Review (Expert: Stefaan De Cnodder, Avri Doria)
Global Switch Management Protocol version 3 (GSMPv3) Service ID Name Space
Service ID Names	RFC 3292	0-1023: IETF Review 1024-65535: RFC Required
Global Switch Management Protocol version 3 (GSMPv3) Traffic Control Name Space
Traffic Control Flags	RFC 3292	Expert Review (Expert: Stefaan De Cnodder, Avri Doria)
Global Switched Telephone Network (GSTN) Address Element Extensions in Email Services
Qual2-Label	RFC 2846	Specification Required (Expert: Unassigned)
Qualif-Type 1	RFC 2846 RFC 3191	Specification Required (Expert: Unassigned)
Service Selector	RFC 2846 RFC 3191	Specification Required (Expert: Unassigned)
GMPLS Routing Parameters for WSON
Types for Subfields of WSON Resource Block Information Registry	RFC 7581	Standards Action
Grant Negotiation and Authorization Protocol (GNAP)
GNAP Access Token Flags	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Assertion Formats	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Authorization Server Discovery Fields	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Client Instance Display Fields	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Client Instance Fields	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Error Codes	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Grant Request Parameters	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Grant Response Parameters	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Interaction Finish Methods	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Interaction Hints	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Interaction Mode Responses	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Interaction Start Modes	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Key Formats	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Key Proofing Methods	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Resource Set Registration Request Parameters	RFC 9767	Expert Review (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Resource Set Registration Response Parameters	RFC 9767	Expert Review (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP RS-Facing Discovery Document Fields	RFC 9767	Expert Review (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP RS-Facing Error Codes	RFC 9767	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Subject Information Request Fields	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Subject Information Response Fields	RFC 9635	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Token Formats	RFC 9767	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Token Introspection Request	RFC 9767	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
GNAP Token Introspection Response	RFC 9767	Specification Required (Expert: Justin Richer, Joseph Salowey, Sudesha Shetty)
Group Domain of Interpretation (GDOI) Payloads
GAP Payload Policy Attributes	RFC 6407	Standards Action
GDOI DOI Exchange Types	RFC 8263	Specification Required (Expert: Brian Weis)
GDOI ID Payload Type Values	RFC 3547	Standards Action
GDOI SA TEK Attributes	RFC 8052	Expert Review (Expert: Brian Weis, Tero Kivinen)
ID Types	RFC 8052	Expert Review (Expert: Brian Weis, Tero Kivinen)
IEC 62351-9 Authentication Values	RFC 8052	Expert Review (Expert: Brian Weis, Tero Kivinen)
IEC 62351-9 Confidentiality Values	RFC 8052	Expert Review (Expert: Brian Weis, Tero Kivinen)
Key Download Type Values	RFC 3547	Standards Action
SA KEK Payload Values
SA TEK Payload Values
Group Secure Association Group Management Protocol (GSAKMP) Parameters
GSAKMP Acknowledgment Types	RFC 4535	Standards Action
GSAKMP Certificate Types	RFC 4535	Expert Review (Expert: Unassigned)
GSAKMP Cryptographic Key Types	RFC 4535	Expert Review (Expert: Unassigned)
GSAKMP Exchange Types	RFC 4535	Standards Action
GSAKMP Group Identification Types	RFC 4535	Standards Action
GSAKMP Identification Classification	RFC 4535	Standards Action
GSAKMP Identification Types	RFC 4535	Expert Review (Expert: Unassigned)
GSAKMP Key Creation Types	RFC 4535	Expert Review (Expert: Unassigned)
GSAKMP Key Download Data Item Types	RFC 4535	Standards Action
GSAKMP Mechanism Types	RFC 4535	Standards Action
GSAKMP Nonce Hash Types	RFC 4535	Expert Review (Expert: Unassigned)
GSAKMP Nonce Types	RFC 4535	Standards Action
GSAKMP Notification Types	RFC 4535	Standards Action
GSAKMP Payload Types	RFC 4535	Standards Action
GSAKMP Policy Token Types	RFC 4535	Standards Action
GSAKMP Rekey Event Types	RFC 4535	Standards Action
GSAKMP Signature Types	RFC 4535	Expert Review (Expert: Unassigned)
Hash Algorithms for HTTP Digest Fields
Hash Algorithms for HTTP Digest Fields	RFC 9530	Specification Required (Expert: Roberto Polli (primary), Lucas Pardue (secondary))
Hash Function Textual Names
Hash Function Textual Names	RFC 8122	Standards Action
Hash-Based Signatures
Leighton-Micali Signatures (LMS)	RFC 8554	0x00000005-0xDDDDDDDC: Specification Required 0xDDDDDDDD-0xFFFFFFFF: Private Use
LM-OTS Signatures	RFC 8554	0x00000001-0xDDDDDDDC: Specification Required 0xDDDDDDDD-0xFFFFFFFF: Private Use
WOTS+ Signatures	RFC 8391	Specification Required (Expert: Andreas Huelsing, Stefan-Lukas Gazdag)
XMSS Signatures	RFC 8391	Specification Required (Expert: Andreas Huelsing, Stefan-Lukas Gazdag)
XMSS^MT Signatures	RFC 8391	Specification Required (Expert: Andreas Huelsing, Stefan-Lukas Gazdag)
Host Identity Protocol (HIP) Parameters
DI-Types	RFC 7401	IETF Review
ESP Transform Suite IDs	RFC 7402	IETF Review
Group IDs	RFC 7401	IETF Review
HI Algorithm	RFC 7401	IETF Review
HIP Certificate Types	RFC 8002	IETF Review
HIP Cipher ID	RFC 7401	IETF Review
HIP NAT Traversal Modes	RFC 5770	IETF Review
HIP Transport Modes	RFC 6261	IETF Review or IESG Approval
HIP Version	RFC 7401	IETF Review
HIP Via Flags	RFC 6028	IETF Review or IESG Approval
HIT Suite ID	RFC 7401	IETF Review
Notify Message Types	RFC 7401	1-50: IETF Review 51-8191: Specification Required 8192-16383: Reserved for Private Use 16384-40959: Specification Required 40960-65535: Reserved for Private Use
Packet Types	RFC 7401	IETF Review
Parameter Types	RFC 7401	0-1023: IETF Review 1024-32767: Specification Required 32768-49151: Reserved for Private Use 49152-61439: Specification Required 61440-65535: IETF Review
Registration Failure Types	RFC 8003	0-200: IETF Review 201-255: Reserved for Private Use
Registration Types	RFC 8003	0-200: IETF Review 201-255: Reserved for Private Use
Suite IDs	RFC 5201	Registry closed per RFC 7401
HTTP Message Signature
HTTP Signature Algorithms	RFC 9421	Specification Required (Expert: Justin Richer, Manu Sporny)
HTTP Signature Component Parameters	RFC 9421	Expert Review (Expert: Justin Richer, Manu Sporny)
HTTP Signature Derived Component Names	RFC 9421	Expert Review (Expert: Justin Richer, Manu Sporny)
HTTP Signature Metadata Parameters	RFC 9421	Expert Review (Expert: Justin Richer, Manu Sporny)
HTTP Origin-Bound Authentication (HOBA) Parameters
HOBA Device Identifier Types	RFC 7486	Specification Required (Expert: Unassigned)
HOBA Key Identifier Types	RFC 7486	Specification Required (Expert: Unassigned)
HOBA Signature Algorithms	RFC 7486	Specification Required (Expert: Unassigned)
Hybrid Public Key Encryption (HPKE)
HPKE AEAD Identifiers	RFC 9180	Specification Required (Expert: Christopher Wood, Richard Barnes)
HPKE KDF Identifiers	RFC 9180	Specification Required (Expert: Christopher Wood, Richard Barnes)
HPKE KEM Identifiers	RFC 9180	Specification Required (Expert: Christopher Wood, Richard Barnes)
Hypertext Transfer Protocol (HTTP) Alt-Svc Parameter Registry
HTTP Alt-Svc Parameter Registry	RFC 7838	Expert Review (Expert: Unassigned)
Hypertext Transfer Protocol (HTTP) Authentication Control Parameters
HTTP Authentication Control Parameters	RFC 8053	Specification Required (Expert: Rifaat Shekh-Yusef, Yutaka Oiwa)
HTTP Mutual Authentication Host Validation Methods	RFC 8120	Expert Review (Expert: Rifaat Shekh-Yusef, Yutaka Oiwa)
Hypertext Transfer Protocol (HTTP) Authentication Scheme Registry
HTTP Authentication Schemes	RFC 9110	IETF Review
HTTP Mutual Authentication Algorithms	RFC 8120	Expert Review (Expert: Rifaat Shekh-Yusef, Yutaka Oiwa)
Hypertext Transfer Protocol (HTTP) Cache Directive Registry
HTTP Cache Directive Registry	RFC 9111	IETF Review
Hypertext Transfer Protocol (HTTP) Cache-Status
HTTP Cache-Status	RFC 9211	Expert Review (Expert: Mark Nottingham)
Hypertext Transfer Protocol (HTTP) Cookie Attributes
Cookie Attributes	draft-ietf-httpbis-rfc6265bis-22	RFC Required
Hypertext Transfer Protocol (HTTP) Digest Algorithm Values
Hash Algorithms for HTTP Digest Authentication	RFC 7616	Specification Required (Expert: Unassigned)
HTTP Digest Algorithm Values	RFC 3230	RFC Required or Specification Required (Expert: James Manger)
Hypertext Transfer Protocol (HTTP) Field Name Registry
Hypertext Transfer Protocol (HTTP) Field Name Registry	RFC 9110 RFC 9651	Specification Required for Permanent registrations, Expert Review for Provisional registrations. (Expert: Mark Nottingham, Roy Fielding)
Hypertext Transfer Protocol (HTTP) Method Registry
HTTP Method Registry	RFC 9110	IETF Review
Hypertext Transfer Protocol (HTTP) Parameters
HTTP Content Coding Registry	RFC 9110	IETF Review
HTTP Forwarded Parameters	RFC 7239	IETF Review
HTTP Preferences	RFC 7240	Specification Required (Expert: Julian Reschke)
HTTP Range Unit Registry	RFC 9110	IETF Review
HTTP Transfer Coding Registry	RFC 9112	IETF Review
Hypertext Transfer Protocol (HTTP) Priority
HTTP Priority	RFC 9218	Key length of one: Specification Required Key length greater than one: Expert Review
Hypertext Transfer Protocol (HTTP) Problem Types
HTTP Problem Types	RFC 9457	Specification Required (Expert: Mark Nottingham, Sanjay Dalal)
Hypertext Transfer Protocol (HTTP) Proxy-Status
HTTP Proxy Error Types	RFC 9209	Expert Review (Expert: Mark Nottingham)
HTTP Proxy-Status Parameters	RFC 9209	Expert Review (Expert: Mark Nottingham)
Hypertext Transfer Protocol (HTTP) Status Code Registry
HTTP Status Codes	RFC 9110	IETF Review
Hypertext Transfer Protocol (HTTP) Upgrade Token Registry
HTTP Upgrade Tokens	RFC 9110	First Come First Served
Hypertext Transfer Protocol (HTTP) Warn Codes
HTTP Warn Codes	RFC 7234	IETF Review
Hypertext Transfer Protocol version 2 (HTTP/2) Parameters
HTTP/2 Error Code	RFC 9113	Expert Review (Expert: Martin Thomson (primary), Julian Reschke (secondary))
HTTP/2 Frame Type	RFC 9113	IETF Review or IESG Approval
HTTP/2 Settings	RFC 9113	Expert Review (Expert: Martin Thomson (primary), Julian Reschke (secondary))
Hypertext Transfer Protocol version 3 (HTTP/3)
HTTP/3 Error Codes	RFC 9114	provisional: Expert Review provisional registration date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved first unassigned codepoint: Standards Action
HTTP/3 Frame Types	RFC 9114	provisional: Expert Review provisional registration date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved first unassigned codepoint: Standards Action
HTTP/3 Settings	RFC 9114	provisional: Expert Review provisional registration date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved first unassigned codepoint: Standards Action
HTTP/3 Stream Types	RFC 9114	provisional: Expert Review provisional registration date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required values 0x1f * N + 0x21 (for non-negative integer values of N): Reserved first unassigned codepoint: Standards Action
IANA OUI Ethernet Numbers
IANA Link Layer Discovery Protocol (LLDP) TLV Subtypes	RFC 8520 RFC 9542	Expert Review (Expert: Eliot Lear, Dan Romascanu)
IANA MAC ADDRESS BLOCK	RFC 9542	See RFC 9542. (Expert: Donald Eastlake (primary), Juan Carlos Zuniga (secondary))
IANA PTP TLV Subtypes	draft-ietf-ntp-over-ptp-08	0-0xFFFF: IETF Review 0x10000-0x7FFFFF: Specification Required 0x800000-0xFFFFFE: Experimental and Private Use
SNAP Protocol Numbers	RFC 9542	Expert Review (Expert: Donald Eastlake (primary), Juan Carlos Zuniga (secondary))
The CFxxxx Series
IANA-Maintained MIBs
IANA-ADDRESS-FAMILY-NUMBERS-MIB	RFC 2677
IANA-BFD-TC-STD-MIB	RFC 7330	IETF Review
IANA-CHARSET-MIB	RFC 3808	See Character Sets
IANA-ENERGY-RELATION-MIB	RFC 7461	Specification Required (Expert: Unassigned)
IANA-ENTITY-MIB	RFC 6933	Expert Review (Expert: Andy Bierman (primary), Jürgen Schönwälder (secondary))
IANA-FINISHER-MIB	RFC 3806	Expert Review (Expert: Ira McDonald, Michael Sweet)
IANA-GMPLS-TC-MIB	RFC 4802	See individual GMPLS registry procedures
IANA-IPPM-METRICS-REGISTRY-MIB	RFC 4148 RFC 6248	This module has been designated Obsolete. The registry will no longer be updated, and the current contents will be maintained as-is.
IANA-ITU-ALARM-TC-MIB	RFC 3877	Expert Review (Expert: Unassigned)
IANA-LANGUAGE-MIB	RFC 3165	Expert Review (Expert: Juergen Schoenwaelder, David Levi)
IANA-MALLOC-MIB	RFC 3559	RFC or designated expert review (Expert: Dave Thaler)
IANA-MAU-MIB	RFC 4836	Expert Review (Expert: Marek Hajduczenia, Operations and Management Area Directors (backup))
IANA-POWER-STATE-SET-MIB	RFC 7460	See https://www.iana.org/assignments/power-state-sets
IANA-PRINTER-MIB	RFC 3805	Expert Review or RFC Required (Expert: Ira McDonald, Michael Sweet)
IANA-RTPROTO-MIB	RFC 2932	RFC or Expert Review (Expert: Dave Thaler)
IANA-SMF-MIB	RFC 7367	IANAsmfOpModeIdTC: First Come First Served. IANAsmfRssaIdTC: 1-127, Standards Action; 128-239, Reserved for Private or Local Use; 240-255, Experimental RFC.
IANA-STORAGE-MEDIA-TYPE-MIB	RFC 7666	Expert Review (Expert: Unassigned)
IANAifType-MIB	RFC 2863 RFC 8892	This is one of the available formats of the Interface Types (ifType) and Tunnel Types (tunnelType) registries. (Expert: Dave Thaler)
IANAolsrv2LinkMetricType-MIB	RFC 7184	Expert Review (Expert: Unassigned)
IANATn3270eTC-MIB	RFC 2561	Working Group Review (see DESCRIPTION clause associated with the MODULE-IDENTITY statement)
iCalendar Element Registries
Actions	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Calendar User Types	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Classifications	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Components	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Display Types	RFC 7986	Expert Review with RFC Required (Expert: Unassigned)
Feature Types	RFC 7986	Expert Review with RFC Required (Expert: Unassigned)
Free/Busy Time Types	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Methods	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Parameters	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Participant Types	RFC 9073	Expert Review (Expert: Ken Murchison, Michael Douglass)
Participation Roles	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Participation Statuses	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Properties	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Proximity Values	RFC 9074	Expert Review with RFC Required (Expert: Ken Murchison, Michael Douglass)
Relationship Types	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
REQUEST-STATUS Values	RFC 5546	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
Resource Types	RFC 9073	Expert Review (Expert: Ken Murchison, Michael Douglass)
Schedule Agent Values Registry	RFC 6638	Expert Review with RFC Required (Expert: Unassigned)
Schedule Force Send Values Registry	RFC 6638	Expert Review with RFC Required (Expert: Unassigned)
STATUS Values	draft-ietf-calext-ical-tasks-17	Standards Action With Expert Review (Expert: Unassigned)
SUBSTATE Values	draft-ietf-calext-ical-tasks-17	Standards Action With Expert Review (Expert: Unassigned)
TASK-MODE Values	draft-ietf-calext-ical-tasks-17	Standards Action With Expert Review (Expert: Unassigned)
Value Data Types	RFC 5545	Expert Review with RFC Required (Expert: Bernard Desruisseaux, Ken Murchison, Mike Douglass)
IDNA Rules and Derived Property Values
IDNA Contextual Rules	RFC 5892 RFC 6452 RFC 8753 RFC 9233	IETF Review
IDNA Derived Properties	RFC 5892 RFC 6452 RFC 8753 RFC 9233	Expert Review (Expert: Patrik Faltstrom (team lead), Takahiro Nemoto, Peter Saint-Andre)
IEEE 802 Numbers
Ethertypes	RFC 9542	Not assigned by IANA. Per RFC 9542, updates to this registry are coordinated with the expert. (Expert: Donald Eastlake (primary), Juan Carlos Zuniga (secondary))
Logical Link Control (LLC) Numbers		Not assigned by IANA. Per RFC 9542, updates to this registry are coordinated with the expert. (Expert: Donald Eastlake (primary), Juan Carlos Zuniga (secondary))
Organizationally Unique Identifiers		Not assigned by IANA. Per RFC 9542, updates to this registry are coordinated with the expert. (Expert: Donald Eastlake (primary), Juan Carlos Zuniga (secondary))
IEEE Std 802.15.4 IETF IE Subtype IDs
IEEE Std 802.15.4 IETF IE Subtype IDs	RFC 8137	Expert Review (Expert: Tero Kivinen, Pat Kinney)
IETF XML Registry
ns	RFC 3688	IETF-controlled space: IETF Review With Expert Review Non-IETF space: Specification Required
publicid	RFC 3688	IETF-controlled space: IETF Review With Expert Review Non-IETF space: Specification Required
rdfschema	RFC 3688	IETF-controlled space: IETF Review With Expert Review Non-IETF space: Specification Required
schema	RFC 3688 RFC 6685	IETF-controlled space: IETF Review With Expert Review Non-IETF space: Specification Required
In Situ OAM (IOAM)
IOAM DEX Extension-Flags	RFC 9326	IETF Review
IOAM DEX Flags	RFC 9326	IETF Review
IOAM E2E-Type	RFC 9197	IETF Review
IOAM Namespace-ID	RFC 9197	0x0000: Expert Review 0x0001-0x7FFF: Private Use 0x8000-0xFFFF: Expert Review
IOAM Option-Type	RFC 9197	IETF Review
IOAM POT-Flags	RFC 9197	IETF Review
IOAM POT-Type	RFC 9197	IETF Review
IOAM Trace-Flags	RFC 9197	IETF Review
IOAM Trace-Type	RFC 9197	IETF Review
In Situ OAM (IOAM) Capabilities
IOAM SoP Capability	draft-ietf-ippm-ioam-conf-state-10	IETF Review
IOAM TSF Capability	draft-ietf-ippm-ioam-conf-state-10	IETF Review
Incident Object Description Exchange Format (IODEF)
Structured Cybersecurity Information (SCI) Specifications	RFC 7203	Specification Required (Expert: Unassigned)
Incident Object Description Exchange Format v2 (IODEF)
Address-category	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
BulkObservable-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
BusinessImpact-severity	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
BusinessImpact-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Confidence-rating	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Contact-role	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Contact-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Counter-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Counter-unit	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Discovery-source	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
DomainData-domain-status	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
DomainData-system-status	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Email-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Expectation-action	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
ExtensionType-dtype	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
HashData-scope	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Incident-purpose	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Incident-status	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
IndicatorExpression-operator	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Key-registryaction	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
NodeRole-category	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
PostalAddress-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
RecordPattern-offsetunit	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
RecordPattern-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
RegistryHandle-registry	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Restriction	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
SoftwareReference-dtype	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
SoftwareReference-spec-id	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
System-category	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
System-ownership	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
SystemImpact-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Telephone-type	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
TimeImpact-duration	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
TimeImpact-metric	RFC 7970	Expert Review (Expert: Roman Danyliw, Takeshi Takahashi)
Instance Manipulation Values
Instance Manipulation Values	RFC 3229	Specification Required (Expert: Unassigned)
Instant Message Disposition Notification (IMDN) Headers
IMDN Headers	RFC 5438	Specification Required (Expert: Unassigned)
Instant Messaging SRV Protocol Label Registry
Instant Messaging SRV Protocol Label Registry	RFC 3861	Specification Required (Expert: Unassigned)
Integrated Services Parameters
Compression Hints	RFC 3006	IETF Review
Parameter Names	RFC 2216	1-127: Parameters defined in RFC 2215 128-254: Parameters defined by author of service specification document (Service and Data Element Naming)
Service Names	RFC 2216	2-127: RFC Required 128-254: Experimental use
Inter-Asterisk eXchange (IAX) Parameters
IAX Authentication Methods	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Calling Presentation	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Calling Type of Number	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Cause Codes	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Control Frame Subclass	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Control Frames	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Dialplan Status Flags	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Encryption Methods	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Frame Types	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX HTML Command Subclasses	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Information Elements	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Media Formats	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Meta Commands	RFC 5457	Expert Review (Expert: Cullen Jennings)
IAX Transit Network Identification Plan	RFC 5457	Expert Review
IAX Type of Network	RFC 5457	Expert Review (Expert: Cullen Jennings)
Interactive Connectivity Establishment (ICE)
ICE Options	RFC 8839	Specification Required (Expert: Ari Keränen)
ICE Transport Protocols	RFC 6544	IETF Review or IESG Approval
Interface Parameters
Interface Types (ifType)	RFC 1213 RFC 2863 RFC 7224 RFC 8892	Expert Review (Expert: Dave Thaler)
Transmission Number Values	RFC 1213 RFC 8892	Specification Required (Expert: Dave Thaler)
Tunnel Types (tunnelType)	RFC 4087 RFC 8675 RFC 8892	Expert Review (Expert: Dave Thaler)
Interior Gateway Protocol (IGP) Parameters
IGP Algorithm Type For Computing Flooding Topology	draft-ietf-lsr-dynamic-flooding-18	Expert Review (Expert: Unassigned)
IGP Algorithm Types	RFC 8665	Standards Action
IGP Flex-Algorithm Path Computation Rules	RFC 9917	Expert Review (Expert: Peter Psenak, Shraddha Hegde)
IGP Flexible Algorithm Definition Flags	RFC 9350	Standards Action
IGP Metric-Type	RFC 9350 RFC 9843	0-127: Standards Action 128-255: User-Defined Metric
IGP MSD-Types	RFC 8491 RFC 9702	Expert Review (Expert: Uma Chunduri, Jeff Tantsura)
Link Attribute Application Identifiers	RFC 9479	Expert Review (Expert: Les Ginsberg, Chris Hopps)
Path Computation Element (PCE) Capability Flags	RFC 9353	IETF Review
PCE Discovery (PCED) Sub-TLV Type Indicators	RFC 9353	Standards Action
Internet - Xerox Network System (XNS) Protocol Mappings
Internet - Xerox Network System (XNS) Protocol Mappings
Internet Control Message Protocol (ICMP) Parameters
Code Fields	RFC 2780
ICMP Extension Object Classes and Class Sub-types	RFC 4884	0-246: First Come First Served 247-255: Private Use
ICMP Type Numbers	RFC 2780 RFC 9899	IESG Approval or Standards Action
Internet Control Message Protocol version 6 (ICMPv6) Parameters
6LoWPAN Capability Bits	RFC 7400	IETF Review or IESG Approval
Address Registration Option Flags	RFC 8505	IETF Review or IESG Approval
Address Registration Option I-Field	RFC 8505	IETF Review or IESG Approval
Address Registration Option Status Values	RFC 6775 RFC 9010	Standards Action
Certificate option (Type 16) Cert Type field	RFC 3971	Standards Action
Crypto-Types	RFC 8928	Specification Required or IESG Approval (Expert: Mohit Sethi)
EDAR Message Flags	RFC 9685	IETF Review or IESG Approval
FMIPv6 Message Types (Value 154)	RFC 5568	RFC Required
ICMPv6 "Code" Fields	RFC 4443
ICMPv6 "type" Numbers	RFC 4443 RFC 9899	0-127 (Error messages): IETF Review 128-255 (Informational messages): IETF Review
IPv6 ND Router Advertisement Flags	RFC 5175	Standards Action or IESG Approval
IPv6 Neighbor Discovery Option Formats	RFC 4861	RFC Required
IPv6 Neighbor Discovery Prefix Information Option Flags	RFC 8425	Standards Action
Option-Code for Handover Assist Information Option (Type 29)	RFC 5271	Standards Action or IESG Approval
Option-Code for Mobile Node Identifier Option (Type 30)	RFC 5271	Standards Action or IESG Approval
P-Field Values	RFC 9685	Standards Action
PvD Option Flags	RFC 8801	Standards Action
Qtypes	RFC 4620	IETF Review
Trust Anchor option (Type 15) Name Type field	RFC 3971 RFC 6495	Standards Action or IESG Approval
Internet Date/Time Format
Timestamp Suffix Tag Keys	RFC 9557	Permanent: Specification Required Provisional: Expert Review
Internet Group Management Protocol (IGMP) Type Numbers
"Code" Fields	RFC 9778	Standards Action
IGMP Type Numbers	RFC 9778	Standards Action
IGMP/MLD Extension Types	RFC 9279	0-65533: IETF Review 65534-65535: Experimental Use
IGMP/MLD Query Message Flags	RFC 9778	Standards Action
IGMP/MLD Report Message Flags	RFC 9778	Standards Action
Internet Key Exchange (IKE) Attributes
Additional Exchanges Defined-- XCHG values	RFC 2409 RFC 9395	Registry closed
Attribute Classes	RFC 2409 RFC 9395	Registry closed
Encryption Algorithm Class Values (Value 1)	RFC 2409 RFC 9395	Registry closed
Exchange Type	RFC 2408 RFC 9395	Registry closed
Group Description (Value 4)	RFC 2409 RFC 9395	Registry closed
Group Type (Value 5)	RFC 2409 RFC 9395	Registry closed
Hash Algorithm (Value 2)	RFC 2409 RFC 9395	Registry closed
IPSEC Authentication Methods (Value 3)	RFC 2409 RFC 9395	Registry closed
ISAKMP Domain of Interpretation (DOI)	RFC 2408 RFC 9395	Registry closed
Life Type (Value 11)	RFC 2409 RFC 9395	Registry closed
Next Payload Types	RFC 2408 RFC 9395	Registry closed
Notify Message Types	RFC 2408 RFC 9395
Notify Messages - Error Types (1-8191)	RFC 2408 RFC 9395	Registry closed
PRF (Value 13)	RFC 2409 RFC 9395	Registry closed
Internet Key Exchange Version 2 (IKEv2) Parameters
Group Key Bag Attributes	RFC 9838	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
Group SA Attributes	RFC 9838	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
Group-Wide Policy Attributes	RFC 9838	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Authentication Method	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Certificate Encodings	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Configuration Payload Attribute Types	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Configuration Payload CFG Types	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Exchange Types	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Gateway Identity Types	RFC 5685	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Hash Algorithms	RFC 7427	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Identification Payload ID Types	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Notification IPCOMP Transform IDs (Value 16387)	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Notify Message Error Types	RFC 7296	0-8191: Expert Review 8192-16383: Private Use
IKEv2 Notify Message Status Types	RFC 7296	16384-40959: Expert Review 40960-65535: Private Use
IKEv2 Payload Types	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Post-quantum Preshared Key ID Types	RFC 8784	1-127: Expert Review 128-255: Private Use
IKEv2 Secure Password Methods	RFC 6467	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Security Protocol Identifiers	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
IKEv2 Traffic Selector Types	RFC 7296	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
Member Key Bag Attributes	RFC 9838	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
ROHC Attribute Types	RFC 5857	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
Transform Type Values	RFC 7296 RFC 9370	Expert Review (Expert: Tero Kivinen, Valery Smyslov)
Internet Message Access Protocol (IMAP) Capabilities
IMAP and JMAP Keywords	RFC 5788 RFC 8621	Expert Review (Expert: Arnt Gulbrandsen, Barry Leiba)
IMAP ANNOTATE Extension Attributes	RFC 5257	Standards Track or IESG-Approved Experimental RFC
IMAP ANNOTATE Extension Entries	RFC 5257	Under vendor namespace: First Come First Served Not under vendor namespace: Standards Track or IESG-Approved Experimental RFC
IMAP Capabilities	RFC 3501 RFC 9051	IETF Review
IMAP Mailbox Name Attributes	RFC 3501 RFC 8457 RFC 9051	IETF Review or Expert Review (Expert: Barry Leiba, Bron Gondwana)
IMAP METADATA Mailbox Entry Registry	RFC 5464	Standards Track or IESG-Approved Experimental RFC
IMAP METADATA Server Entry Registry	RFC 5464	Standards Track or IESG-Approved Experimental RFC
IMAP Quota Resource Types	RFC 9208	Specification Required (Expert: Alexey Melnikov, Ken Murchison)
IMAP Response Codes	RFC 5530	Expert Review (Expert: Arnt Gulbrandsen, Dave Cridland)
IMAP Threading Algorithms	RFC 5256	Standards Track or IESG-Approved Experimental RFC
IMAP URLAUTH Access Identifiers and Prefixes	RFC 5593	IETF Review
IMAP URLAUTH Authorization Mechanism Registry	RFC 4467	Standards Track or IESG-Approved Experimental RFC
LIST-EXTENDED options	RFC 5258	FCFS; IANA approval template in RFC 5258 section 9.3
LIST-EXTENDED response	RFC 5258	IANA approval template in RFC 5258 section 9.3
Internet Message Store Events
Event Names	RFC 5423	name starts wth "vnd."; intended for private use: First Come First Served name doesn't start with "vnd."; intended for interoperable use: IETF Review
Event Parameters	RFC 5423	name starts wth "vnd."; intended for private use: First Come First Served name doesn't start with "vnd."; intended for interoperable use: IETF Review
Internet Open Trading Protocol (IOTP) Codes
Algorithm/Name	RFC 2801	Expert Review (Expert: David Burdett)
Attribute/Content	RFC 2801	RFC Required (Expert: David Burdett)
Brand/BrandId	RFC 2801	First Come First Served (Expert: David Burdett)
CurrencyAmount/CurrCode	RFC 2801	First Come First Served (Expert: David Burdett)
CurrencyAmount/CurrCodeType	RFC 2801	Expert Review (Expert: David Burdett)
DeliveryData/DelivMethod	RFC 2801	Expert Review (Expert: David Burdett)
PackagedContent/Content	RFC 2801	Expert Review (Expert: David Burdett)
RelatedTo/RelationshipType	RFC 2801	Expert Review (Expert: David Burdett)
Status/StatusType	RFC 2801	RFC Required (Expert: David Burdett)
TradingRole/Trading Role	RFC 2801	RFC Required (Expert: David Burdett)
TransId/IotpTransType	RFC 2801	RFC Required (Expert: David Burdett)
Internet Printing Protocol (IPP) Registrations
Attribute Group Tags	RFC 8011	Specification Required (Expert: Ira McDonald, Michael Sweet)
Attribute Syntaxes	RFC 8011	Specification Required (Expert: Ira McDonald, Michael Sweet)
Attributes	RFC 8011	Expert Review (Expert: Ira McDonald, Michael Sweet)
Enum Attribute Values	RFC 8011	type1: Specification Required type2: Expert Review
Keyword Attribute Values	RFC 8011	type1: Specification Required type2: Expert Review
Objects	RFC 8011	Specification Required (Expert: Ira McDonald, Michael Sweet)
Operations	RFC 8011	Expert Review (Expert: Ira McDonald, Michael Sweet)
Out-of-Band Attribute Value Tags	RFC 8011	Specification Required (Expert: Ira McDonald, Michael Sweet)
Status Codes	RFC 8011	Expert Review (Expert: Ira McDonald, Michael Sweet)
Internet Protocol version 4 (IPv4) Address Space
Allocations made from the Current Recovered IPv4 Pool		Global Policy for Post Exhaustion IPv4 Allocation Mechanisms by the IANA (Ratified 6 May 2012)
Current Recovered IPv4 Pool		Global Policy for Post Exhaustion IPv4 Allocation Mechanisms by the IANA (Ratified 6 May 2012)
IPv4 Address Space	RFC 7249	Allocations to RIRs are made in line with the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing. All other assignments require IETF Review.
IPv4 Special-Purpose Address Space	RFC 5736 RFC 6890 RFC 8190	IETF Review
Internet Protocol Version 4 (IPv4) Parameters
IP Option Numbers		Not defined
IP Time to Live Parameter		Not defined
IP TOS Parameters		Registrations no longer accepted
IPv4 Router Alert Option Values	RFC 5350	IETF Review
Type-of-Service Values		Registrations no longer accepted
Internet Protocol version 6 (IPv6) Global Unicast Allocations
IPv6 Global Unicast Address Space	RFC 7249	Allocations to RIRs are made in line with the Global Policy published at http://www.icann.org/en/resources/policy/global-addressing. All other assignments require IETF Review.
IPv6 Special-Purpose Address Space	RFC 4773 RFC 6890 RFC 8190	IETF Review
Internet Protocol Version 6 (IPv6) Parameters
Destination Options and Hop-by-Hop Options	RFC 8200 RFC 2780 RFC 9673	IESG Approval, IETF Review or Standards Action
IPv6 Extension Header Types	RFC 2780 RFC 5237 RFC 7045 RFC 9899	Standards Action or IESG Approval
Next Header Types	RFC 8200 RFC 2780 RFC 7045
Routing Types	RFC 8200 RFC 5871	IETF Review or IESG Approval
RPL-option-TLV	RFC 6553	IETF Review
Segment Routing Header Flags	RFC 8754	IETF Review
Segment Routing Header TLVs	RFC 8754	IETF Review
TaggerId Types	RFC 6621	IETF Review
Internet Small Computer System Interface (iSCSI) Parameters
iSCSI Asynchronous Events	RFC 7143	Standards Action
iSCSI authentication methods	RFC 7143	IETF Review
iSCSI digests	RFC 7143	IETF Review
iSCSI Login Response Status Codes	RFC 7143	Standards Action
iSCSI Login/Text Keys	RFC 7145 RFC 7143	IETF Review
iSCSI Opcodes	RFC 7143	Standards Action to define the semantics of the opcode; Expert Review to select the specific opcode(s) (Expert: Unassigned)
iSCSI Protocol Level	RFC 7144	Expert Review and Standards Action (Expert: Unassigned)
iSCSI Reject Reason Codes	RFC 7143	Standards Action
iSCSI Task Management Function Codes	RFC 7143	Standards Action
iSCSI Task Management Function Response Codes	RFC 7144	Standards Action
iSER Opcodes	RFC 7145	Standards Action
SRP_GROUP key values	RFC 3723	Specification Required (Expert: Unassigned)
Internet Storage Name Service (iSNS) Parameters
Block Storage Protocols	RFC 4171	Expert Review (by IPS WG Chairperson or by Designated Expert) (Expert: David Black)
Standard iSNS Attributes	RFC 4171	IETF Review
Intrusion Detection Exchange Protocol (IDXP) Options
IDXP Options	RFC 4767	Expert Review (Expert: Ben Feinstein)
Intrusion Detection Message Exchange Format (IDMEF) Parameters
Attribute Values	RFC 4765	Specification Required (Expert: Unassigned)
Class and Attribute Names	RFC 4765	IETF Review
IP Flow Information Export (IPFIX) Entities
IPFIX Information Element Data Types	RFC 5610	Standards Action
IPFIX Information Element Semantics	RFC 5610	Standards Action
IPFIX Information Element Units	RFC 5610	Expert Review (Expert: IE Doctors (Andrew Feren, Brian Trammell, Nevil Brownlee, Paul Aitken))
IPFIX Information Elements	RFC 7012 RFC 9710	Expert Review (Expert: IE Doctors (Andrew Feren, Brian Trammell, Nevil Brownlee, Paul Aitken))
IPFIX ipv6ExtensionHeaders Bits	RFC 9740	Expert Review (Expert: Paul Aitken, Jen Linkova)
IPFIX Set IDs	RFC 7011	Standards Action
IPFIX Structured Data Types Semantics	RFC 6313	Standards Action
IPFIX Version Numbers	RFC 7011	Standards Action
IP Multicast Traceroute Facility (Mtrace)
Mtrace2 Forwarding Codes	RFC 8487	Specification Required (Expert: Unassigned)
Mtrace2 TLV Types	RFC 8487	Specification Required (Expert: Unassigned)
IP Version Numbers
IP Version Numbers	RFC 2780	Standards Action
IPS Protocol# (Protocol Number) Field
Protocol# (Protocol Number) Field	RFC 3643	1-239: Standards Action 240-255: Private Use
IPSECKEY Resource Record Parameters
Algorithm Type Field	RFC 4025 RFC 9373	IETF Review
Gateway Type Field	RFC 4025	Standards Action
IPv4 Multicast Address Space
AD-HOC Block I (224.0.2.0 - 224.0.255.255)	RFC 5771	Expert Review, IESG Approval, or Standards Action (Expert: Stig Venaas)
AD-HOC Block II (224.3.0.0-224.4.255.255 (224.3/16, 224.4/16))	RFC 5771	Expert Review, IESG Approval, or Standards Action (Expert: Stig Venaas)
AD-HOC Block III (233.252.0.0-233.255.255.255 (233.252/14))	RFC 5771	Expert Review, IESG Approval, or Standards Action (Expert: Stig Venaas)
DIS Transient Groups 224.252.0.0-224.255.255.255 (224.252/14))	RFC 2365	(Expert: Stig Venaas)
GLOP Block	RFC 3180	(Expert: Stig Venaas)
Internetwork Control Block (224.0.1.0 - 224.0.1.255 (224.0.1/24))	RFC 5771	Expert Review, IESG Approval, or Standards Action (Expert: Stig Venaas)
Local Network Control Block (224.0.0.0 - 224.0.0.255 (224.0.0/24))	RFC 5771	Expert Review, IESG Approval, or Standards Action (Expert: Stig Venaas)
Relative Addresses used with Scoped Multicast Addresses	RFC 5771	(Expert: Stig Venaas)
RESERVED (224.1.0.0-224.1.255.255 (224.1/16))	RFC 5771	(Expert: Stig Venaas)
RESERVED (224.5.0.0-224.251.255.255 (251 /16s))	RFC 5771	(Expert: Stig Venaas)
RESERVED (225.0.0.0-231.255.255.255 (7 /8s))	RFC 5771	(Expert: Stig Venaas)
Scoped Multicast Ranges	RFC 5771	(Expert: Stig Venaas)
SDP/SAP Block (224.2.0.0-224.2.255.255 (224.2/16))	RFC 5771	(Expert: Stig Venaas)
Source-Specific Multicast Block (232.0.0.0-232.255.255.255 (232/8))	RFC 5771	(Expert: Stig Venaas)
Unicast-Prefix-based IPv4 Multicast Addresses	RFC 6034	(Expert: Stig Venaas)
IPv6 Address Space
IPv6 Address Space
IPv6 Anycast Address Space
IPv6 Anycast Address Space	RFC 4291 RFC 2526	IESG Approval
IPv6 Anycast Subnet-Router Anycast Address	RFC 4291	IESG Approval
IPv6 Low Power Personal Area Network Parameters
Critical 6LoWPAN Routing Header Type	RFC 8138	RFC Required
Dispatch Type Field	RFC 4944 RFC 8025	Specification Required (Expert: Carles Gomez, Shwetha Bhandari)
Elective 6LoWPAN Routing Header Type	RFC 8138	RFC Required
ESC Extension Types	RFC 8066	Specification Required (Expert: Shwetha Bhandari)
LOWPAN_NHC Header Type	RFC 6282	IETF Review
Short Address Fields	RFC 4944	Specification Required (Expert: Carles Gomez)
IPv6 Multicast Address Space
Dynamic Multicast Group IDs	RFC 3307 draft-ietf-pim-updt-ipv6-dyn-mcast-addr-grp-id-13	0x90000000-0xEFFFFFFF: Standards Action 0xFD000000-0xFDFFFFFF: Private Use 0xFE000000-0xFEFFFFFF: Experimental Use
IPv6 Multicast Address Scopes	RFC 7346	IETF Review (Expert: Stig Venaas)
Link-Local Scope Multicast Addresses	RFC 3307	Expert Review (Expert: Stig Venaas)
Node-Local Scope Multicast Addresses	RFC 4291 RFC 3307	Expert Review (Expert: Stig Venaas)
Site-Local Scope Multicast Addresses	RFC 3307	Expert Review (Expert: Stig Venaas)
Unicast-based (Including SSM) Multicast Group IDs	RFC 3307	Addresses in FF3X:0::/32 but not listed below are reserved for future SSM address use, but are currently invalid. FF3X:0:0:0:0:0:0:0-FF3X:0:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF (FF3X:0::/32) FF3X:0:0:0:0:0:4000:0-FF3X:0:0:0:0:0:7FFF:FFFF - Expert Review; see registry at https://www.iana.org/assignments/perm-mcast-groupids FF3X:0:0:0:0:0:8000:0-FF3X:0:0:0:0:0:FFFF:FFFF - Uses dynamic assignment according to the protocols listed in the https://www.iana.org/assignments/ipv6-multicast-addresses/ipv6-multicast-addresses.xhtml#dynamic-multicast-group-idsDynamic Multicast Group IDs registry (Expert: Stig Venaas)
Variable Scope Multicast Addresses	RFC 3307	Expert Review (Expert: Stig Venaas)
IPv6 Over the TSCH Mode of IEEE 802.15.4 (6TiSCH)
6P CellOptions Bitmap	RFC 8480	IETF Review or IESG Approval
6P Command Identifiers	RFC 8480	IETF Review or IESG Approval
6P Message Types	RFC 8480	IETF Review or IESG Approval
6P Return Codes	RFC 8480	IETF Review or IESG Approval
6P Scheduling Function Identifiers	RFC 8480	0-127: IETF Review or IESG Approval 128-255: Expert Review
6P Version Numbers	RFC 8480	IETF Review or IESG Approval
Constrained Join Protocol (CoJP) Key Usage	RFC 9031	Integer values less than -65536: Private Use Integer values from -65536 to -257: Specification Required Integer values from -256 to 255: Standards Action Integer values from 256 to 65535: Specification Required Integer values greater than 65535: Expert Review
Constrained Join Protocol (CoJP) Parameters	RFC 9031	Integer values less than -65536: Private Use Integer values from -65536 to -257: Specification Required Integer values from -256 to 255: Standards Action Integer values from 256 to 65535: Specification Required Integer values greater than 65535: Expert Review
Constrained Join Protocol (CoJP) Unsupported Configuration Codes	RFC 9031	Integer values less than -65536: Private Use Integer values from -65536 to -257: Specification Required Integer values from -256 to 255: Standards Action Integer values from 256 to 65535: Specification Required Integer values greater than 65535: Expert Review
IPv6 Router Alert Option Values
IPv6 Router Alert Option Values	RFC 2711 RFC 9805	Registry closed
IPv6 Top Level Aggregation Identifier Assignments
Sub-TLA Identifier Assignments	RFC 4147	Registrations no longer accepted
TLA Identifier Assignments	RFC 4147	Registrations no longer accepted
IS-IS
IS-IS Application Identifiers for Generic Information TLV	RFC 6823	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Authentication Type Codes	RFC 5304	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Bit Values for Flooding Parameters Flags Sub-TLV	RFC 9681	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Bit Values for Prefix Attribute Flags Sub-TLV	RFC 7794	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Group Address Type Codes for GADDR-TLV	RFC 7176	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Multi-Topology ID Values	RFC 5120	0-3995: Expert Review 3996-4095: Private Use
IS-IS Neighbor Link-Attribute Bit Values	RFC 5029 RFC 9667 RFC 9650	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS PDU Registry	RFC 7176	IETF Review
IS-IS SRv6 Adjacency SID Sub-TLVs Flags	RFC 9352	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS SRv6 Capabilities Sub-TLV Flags	RFC 9352	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS SRv6 End SID Sub-TLV Flags	RFC 9352	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS SRv6 Locator TLV Flags	RFC 9352	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-Sub-TLV Codepoints for Application-Specific Link Attributes	RFC 9479 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-Sub-TLVs for BIER Info Sub-TLV	RFC 8401 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-Sub-TLVs for Flexible Algorithm Definition Sub-TLV	RFC 9350 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-Sub-TLVs for Flood Reflection Discovery Sub-TLV	RFC 9377 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-Sub-TLVs for SRv6 Capabilities Sub-TLV	RFC 9352 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-Sub-TLVs for SRv6 SID Sub-TLVs	RFC 9352 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for Application-Specific SRLG TLV	RFC 9479 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for Flooding Parameters TLV	RFC 9681	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for IS-IS Router CAPABILITY TLV	RFC 7981 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for MT-Capability TLV	RFC 6329 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for MT-Port-Cap-TLV	RFC 7176	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for Reverse Metric TLV	RFC 8500 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for Segment Identifier/Label Binding TLVs	RFC 8667 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for the Area Proxy TLV	RFC 9666	Expert Review with RFC Required (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for TLVs Advertising Neighbor Information	RFC 5305 RFC 5316 RFC 7370 RFC 8668 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability	RFC 5305 RFC 7370 RFC 9352 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
IS-IS Top-Level TLV Codepoints	RFC 3563 RFC 6233 RFC 7356 RFC 8918 RFC 9885	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
LSP Flooding Scope Identifier Registry	RFC 7356	Expert Review (Expert: Chris Hopps, Hannes Gredler, Les Ginsberg)
Java Message Service (JMS) URI Scheme Variants
JMS URI Scheme Variants	RFC 6167	First Come First Served
JSCalendar
JSCalendar Enum Values	RFC 8984	Expert Review (Expert: Robert Stepanek, Neil Jenkins, Michael Douglass)
JSCalendar Properties	RFC 8984 draft-ietf-jmap-calendars-22	Expert Review (Expert: Robert Stepanek, Neil Jenkins, Michael Douglass)
JSCalendar Types	RFC 8984	Expert Review (Expert: Robert Stepanek, Neil Jenkins, Michael Douglass)
JSContact
JSContact Enum Values	RFC 9553	Major version change required: Standards Action All other assignments: Specification Required
JSContact Profile	draft-ietf-calext-jscontact-profiles-14	Reference updates: Expert Review New assignments: Specification Required
JSContact Properties	RFC 9553	Major version change required: Standards Action All other assignments: Specification Required
JSContact Types	RFC 9553	Major version change required: Standards Action All other assignments: Specification Required
JSContact Version	RFC 9553	Major version change required: Standards Action All other assignments: Specification Required
JSON Meta Application Protocol (JMAP)
JMAP Capabilities	RFC 8620	intended use field is “common" or “placeholder”: Specification Required all other values: Expert Review
JMAP Data Types	RFC 9404	Specification Required (Expert: Ken Murchison, Neil Jenkins, Arnt Gulbrandsen, Joris Baum)
JMAP Error Codes	RFC 8620	Expert Review (Expert: Neil Jenkins, Chris Newman, Arnt Gulbrandsen, Joris Baum)
JSON Object Signing and Encryption (JOSE)
JSON Web Encryption Compression Algorithms	RFC 7518	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Key Elliptic Curve	RFC 7518 RFC 7638	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Key Operations	RFC 7517	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Key Parameters	RFC 7517 RFC 7638	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Key Set Parameters	RFC 7517	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Key Types	RFC 7518 RFC 7638	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Key Use	RFC 7517	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Signature and Encryption Algorithms	RFC 7518 RFC 9864	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Signature and Encryption Header Parameters	RFC 7515	Specification Required (Expert: Sean Turner, Mike Jones, Filip Skokan)
JSON Web Token (JWT)
JSON Web Token Claims	RFC 7519	Specification Required (Expert: Brian Campbell, Mike Jones, Nat Sakimura, Filip Skokan)
JWT Confirmation Methods	RFC 7800	Specification Required (Expert: John Bradley, Hannes Tschofenig)
PASSporT RCD Claim Types	RFC 9795	Specification Required (Expert: Chris Wendt, Jon Peterson)
PASSporT Resource Priority Header (rph) Types	RFC 8443	Specification Required (Expert: Martin Dolly, Subir Das)
Personal Assertion Token (PASSporT) Extensions	RFC 8225	Specification Required (Expert: Chris Wendt (primary), Russ Housley (secondary))
JSONPath
Function Extensions	RFC 9535	Expert Review (Expert: Glyn Normington)
Kerberized Internet Negotiation of Keys (KINK) Parameters
KINK Error Codes	RFC 4430	0-8191: Standards Action or non standards-track RFCs with Expert Review 8192-16383: Private Use 16384-4294967295: Reserved
KINK Message Types	RFC 4430	1-127: Standards Action or non standards-track RFCs with Expert Review 128-255: Private Use
KINK Next Payload Types	RFC 4430	0-127: Standards Action or non standards-track RFCs with Expert Review 128-255: Private Use
Kerberos Parameters
FAST Armor Types	RFC 6113	Standards Action
FAST Options	RFC 6113	Standards Action
Kerberos Checksum Type Numbers	RFC 3961	Standards Action for standards-track RFCs; non-standards-track RFCs must be reviewed by an expert. (Expert: Ken Raeburn)
Kerberos Encryption Type Numbers	RFC 3961	Standards Action for standards-track RFCs; non-standards-track RFCs must be reviewed by an expert. (Expert: Ken Raeburn)
Kerberos Message Transport Types	RFC 6784	IETF Review
Kerberos Second Factor Types	RFC 9588	Specification Required (Expert: Simo Sorce, Greg Hudson)
Kerberos SPAKE Groups	RFC 9588	Specification Required (Expert: Simo Sorce, Greg Hudson)
Kerberos TCP Extensions	RFC 5021	0-29: Standards Action or IESG Approval 30: Reserved
Pre-authentication and Typed Data	RFC 6113	Expert Review (Expert: Sam Hartman (primary), Larry Zhu (secondary))
Well-Known Kerberos Principal Names	RFC 6111	Specification Required (Expert: Unassigned)
Well-Known Kerberos Realm Names	RFC 6111	Specification Required (Expert: Unassigned)
Kerberos V GSS-API Mechanism Parameters
Kerberos V GSS-API Mechanism Extension Types	RFC 6542	0x00000000 - 0x000003FF: IETF Review 0x00000400 - 0xFFFFF3FF: Specification Required
Kerberos V GSS-API Token Type Identifiers	RFC 4121 RFC 7055	Expert Review (Expert: Sam Hartman)
Keying and Authentication for Routing Protocols (KARP) Parameters
Cryptographic Protocol ID	RFC 7166	Standards Action
KeyNote Parameters
KeyNote app_domain Identifiers	RFC 2704	First Come First Served
KeyNote Public Key Format Identifiers	RFC 2704	Specification Required (Expert: Unassigned)
KeyNote Signature Algorithm Identifiers	RFC 2704	Specification Required (Expert: Unassigned)
KeyTable
KeyTable AlgIDs	RFC 7210	First Come First Served
KeyTable KDFs	RFC 7210	First Come First Served
KeyTable Protocols	RFC 7210	Specification Required (Expert: Unassigned)
Label Distribution Protocol (LDP) Parameters
Experiment ID Name Space	RFC 5036	0x00000000-0xefffffff: First Come First Served 0xf0000000-0xffffffff: Experiment Ids - Reserved for Private Use
Forwarding Equivalence Class (FEC) Type Name Space	RFC 5036 RFC 7358	0-127: IETF Review 128-191: First Come First Served
LDP MP Opaque Value Element basic type	RFC 6388	Standards Action
LDP MP Opaque Value Element extended type	RFC 6388	0-32767: Standards Action 32768-65535: First Come First Served
LDP MP Status Value Element type	RFC 6388	Standards Action
LDP Targeted Application Identifier	RFC 8223	0x0001-0x1FFF: IETF Review 0x2000-0xF7FF: First Come First Served
MAC Flush Flags	RFC 7361	Standards Action
Message Type Name Space	RFC 5036	0x0001-0x00FF: IETF Review 0x0100-0x01FF: IETF Review 0x0200-0x02FF: IETF Review 0x0300-0x03FF: IETF Review 0x0400-0x04FF: IETF Review 0x0500-0x05FF: IETF Review 0x0600-0x3DFF: IETF Review 0x3E00-0x3EFF: LDP Vendor-Private Extensions 0x3F00-0x3FFF: LDP Experimental Extensions
Status Code Name Space	RFC 5036	0x00000000-0x1FFFFFFF: IETF Review 0x20000000-0x3EFFFFFF: First Come First Served 0x3F000000-0x3FFFFFFF: Private Use
TLV Type Name Space	RFC 5036	0x0001-0x07FF: IETF Review 0x0800-0x08FF (CR-LDP): IETF Review 0x0900-0x3DFF: IETF Review 0x3E00-0x3EFF: LDP Vendor-Private Extensions 0x3F00-0x3FFF: LDP Experimental Extensions
Label Generation Ruleset (LGR) Dispositions
Private Dispositions	RFC 7940	First Come First Served
Standard Dispositions	RFC 7940	Specification Required (Expert: Unassigned)
Language Tags
Language Subtag Registration Form Archive	RFC 5646	See the Language Subtag Registry.
Language Subtag Registry	RFC 5645 RFC 5646	Expert Review (Expert: Doug Ewell)
Language Tag Extensions	RFC 5646	IETF Review or IESG Approval
Language Tag Registration Form Archive (OBSOLETE)	RFC 3066 RFC 4646	Registry closed
Language Tags (OBSOLETE)	RFC 3066 RFC 4646	Registry closed
Layer Two Tunneling Protocol "L2TP"
ATM Alarm Status AVP (Attribute Type 88) Values	RFC 4454	Expert Review (Expert: Carlos Pignataro (primary), Ignacio Goyret (secondary))
ATM-Specific Sublayer bits	RFC 4454	IETF Review
Bearer Field definition	RFC 2661	Standards Action
Circuit Status Bits	RFC 3931	IETF Review
Control Message Attribute Value Pairs	RFC 3438	Expert Review (Expert: Carlos Pignataro (primary), Ignacio Goyret (secondary))
Data Sequencing Level	RFC 3931	Expert Review (Expert: Carlos Pignataro (primary), Ignacio Goyret (secondary))
Default L2-Specific Sublayer bits	RFC 3931
Framing Field definition	RFC 2661	Standards Action
L2-Specific Sublayer Type	RFC 3931	Expert Review (Expert: Carlos Pignataro (primary), Ignacio Goyret (secondary))
L2TPv3 Pseudowire Types	RFC 3931	0-32767: Expert Review 32768-65535: First Come First Served
Leading Bits of the L2TP AVP Header	RFC 2661 RFC 3931	Standards Action
Leading Bits of the L2TP Message Header	RFC 2661 RFC 3931	Standards Action
Message Type AVP (Attribute Type 0) Values	RFC 3438	Expert Review (Expert: Carlos Pignataro (primary), Ignacio Goyret (secondary))
PPP Disconnect Cause Code (Attribute Type 46) Values	RFC 3145
Proxy Authen Type AVP (Attribute Type 29) Values	RFC 2661	First Come First Served
Result Code AVP (Attribute Type 1) Values	RFC 3438	Expert Review (Expert: Carlos Pignataro (primary), Ignacio Goyret (secondary))
Service Category AVP (Attribute Type 42) Flag Field	RFC 3301	Specification Required (Expert: Carlos Pignataro (primary), Ignacio Goyret (secondary))
VCCV Capability AVP (Attribute Type 96) Values	RFC 5085	IETF Review
Layered Coding Transport (LCT) Header Extension Types
LCT Header Extension Types	RFC 5651	0-63: IETF Review 64-127: Specification Required 128-191: IETF Review 192-255: Specification Required
Level of Assurance (LoA) Profiles
Level of Assurance Profiles	RFC 6711	Expert Review (Expert: John Bradley, Joni Brennan, Leif Johansson)
Licklider Transmission Protocol (LTP) Parameters
LTP Cancel Segment Reason Codes	RFC 7116	Specification Required (Expert: Unassigned)
LTP Ciphersuites	RFC 5327	Specification Required (Expert: Unassigned)
LTP Client Service Identifiers	RFC 7116	Specification Required (Expert: Unassigned)
LTP Engine Numbers	RFC 7116	1-16383: Expert Review 268435456-4398046511103: First Come First Served for requests of up to 16384 values. Larger requests require Expert Review.
LTP Extension Tags	RFC 5326	Specification Required (Expert: Unassigned)
Lightweight Directory Access Protocol (LDAP) - pcimSchema Descriptors
pcimSchema LDAP Descriptors	RFC 3703	TBD
Lightweight Directory Access Protocol (LDAP) Parameters
Attribute Description Options	RFC 4520	x- Private Use (can not be registered) e- Reserved for Experiments, First Come First Served All others: Standards Action or Expert Review with Specification (Expert: Rolf Sonneveld, Andrew Findlay)
Bind Authentication Method	RFC 4520	0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) (Expert: Rolf Sonneveld, Andrew Findlay)
Internet Directory Numbers (iso.org.dod.internet.directory [1.3.6.1.1.])	RFC 4520 RFC 2578	Specification Required (Expert: Rolf Sonneveld, Andrew Findlay)
LDAP authzid prefixes	RFC 4520	x- Private Use e- Reserved for Experiments, First Come First Served All others, Standards Action or Expert Review with Specification Required (Expert: Rolf Sonneveld, Andrew Findlay)
LDAP Filter Choices	RFC 4520	Standards Action
LDAP ModifyRequest Operations	RFC 4520	0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) (Expert: Rolf Sonneveld, Andrew Findlay)
LDAP Search Scopes	RFC 4520	0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) (Expert: Rolf Sonneveld, Andrew Findlay)
LDAP Syntaxes	RFC 4520	First Come First Served
LDAPMessage types	RFC 4520	Standards Action
Object Identifier Descriptors	RFC 4520	x- Private Use (can not be registered) e- Reserved for Experiments, First Come First Served All others: Expert Review (Expert: Rolf Sonneveld, Andrew Findlay)
Protocol Mechanisms	RFC 4520	First Come First Served
resultCode values	RFC 4520	0-1023 Standards Action (can not start with e- or x-) 1024-4095 Expert Review with Specification Required (can not start with e- or x-) 4096-16383 First Come First Served (Shall start with e-) 16384 and higher Private Use (Shall start with x-) (Expert: Rolf Sonneveld, Andrew Findlay)
Link Management Protocol (LMP) Parameters
LMP Behavior Configuration Flags	RFC 6898	Standards Action
LMP Message Type Name Space	RFC 4204	0-127: Standards Action 128-247: Expert Review
LMP Object Class name space and Class type (C-Type)	RFC 4204	0-127: Standards Action 128-247: Expert Review
Link Relations
Link Relation Types	RFC 8288	Specification Required (Expert: Mark Nottingham, Julian Reschke, Jan Algermissen)
Link State Routing TE Capabilities
TE Node Capabilities	RFC 5073	IETF Review
Locally-Served DNS Zones
IPv4 Locally-Served DNS Zone Registry	RFC 6303	IETF Review
IPv6 Locally-Served DNS Zone Registry	RFC 6303	IETF Review
service.arpa Subdomain	RFC 9665	Standards Action or IESG Approval
Transport-Independent Locally-Served DNS Zone Registry	RFC 8375	IETF Review
Location-to-Service Translation (LoST) Location Profiles
LoST Location Profiles	RFC 5222 RFC 9036	Specification Required (Expert: Henning Schulzrinne)
Locator/ID Separation Protocol (LISP) Parameters
LISP ACT Values	RFC 9301	IETF Review or IESG Approval
LISP Address Type Codes (CLOSED)	RFC 6830 RFC 9301
LISP Algorithm ID Numbers	RFC 9301	First Come First Served
LISP Canonical Address Format (LCAF) Types	RFC 8060	Specification Required (Expert: Luigi Iannone, Albert Cabellos)
LISP Control Plane Header Bits: EID-Record	RFC 9301	Specification Required (Expert: Albert Cabellos, Dino Farinacci)
LISP Control Plane Header Bits: Encapsulated Control Message (ECM)	RFC 9301	Specification Required (Expert: Albert Cabellos, Dino Farinacci)
LISP Control Plane Header Bits: Map-Register	RFC 9301	Specification Required (Expert: Albert Cabellos, Dino Farinacci)
LISP Control Plane Header Bits: Map-Reply	RFC 9301	Specification Required (Expert: Albert Cabellos, Dino Farinacci)
LISP Control Plane Header Bits: Map-Request	RFC 9301	Specification Required (Expert: Albert Cabellos, Dino Farinacci)
LISP Control Plane Header Bits: Map-Request-Record	RFC 9437	Specification Required (Expert: Albert Cabellos, Dino Farinacci)
LISP Control Plane Header Bits: RLOC-Record	RFC 9301	Specification Required (Expert: Albert Cabellos, Dino Farinacci)
LISP Crypto Cipher Suite	RFC 8061	First Come First Served
LISP ECM Authentication Data Types	RFC 9303	Specification Required (Expert: Damien Saucez, Luigi Iannone)
LISP Map-Reply Authentication Data Types	RFC 9303	Specification Required (Expert: Damien Saucez, Luigi Iannone)
LISP Packet Types	RFC 9304 RFC 9301	Standards Action
LISP Shared Extension Message Type Sub-types	RFC 9304	0-1023: Standards Action 1024-4095: First Come First Served
LISP-GPE Next Protocol	RFC 9305	Specification Required (Expert: Darrel Lewis, Luigi Iannone)
LISP-SEC Authentication Data Key Derivation Function IDs	RFC 9303	Specification Required (Expert: Damien Saucez, Luigi Iannone)
LISP-SEC Authentication Data Key Wrap IDs	RFC 9303	Specification Required (Expert: Damien Saucez, Luigi Iannone)
LISP-SEC Preferred Authentication Data HMAC IDs	RFC 9303	Specification Required (Expert: Damien Saucez, Luigi Iannone)
Machine Names
Machine Names		Not defined
"Magic Numbers" for ISAKMP Protocol
IPSEC AH Transform Identifiers	RFC 2407 RFC 9395	Registry closed
IPSEC ESP Transform Identifiers	RFC 2407 RFC 9395	Registry closed
IPSEC Identification Type	RFC 2407 RFC 9395	Registry closed
IPSEC IPCOMP Transform Identifiers	RFC 2407 RFC 9395	Registry closed
IPSEC ISAKMP Transform Identifiers	RFC 2407 RFC 9395	Registry closed
IPSEC Labeled Domain Identifiers	RFC 2407 RFC 9395	Registry closed
IPSEC Notify Message Types	RFC 2407 RFC 9395	Registry closed
IPSEC Security Association Attributes	RFC 2407 RFC 9395	Registry closed
IPSEC Security Protocol Identifiers	RFC 2407 RFC 9395	Registry closed
IPSEC Situation Definition	RFC 2407 RFC 9395	Registry closed
Mail Parameters
Address Literal Tags	draft-ietf-emailcore-rfc5321bis-43
Encoding Header Field Keywords	RFC 1505	Specification Required (Expert: Unassigned)
Mail Header Confidentiality Policies	RFC 9788	Specification Required or IETF Review (see Note) (Expert: Unassigned)
Mail Transmission Types	RFC 821 RFC 822 RFC 5321	Standards Action or IESG-Approved Experimental RFC
Multicast Email SMTP Extensions	RFC 8494	Specification Required (Expert: Alexey Melnikov (primary), RFC Independent Submissions Editor (secondary))
Registered-states	RFC 6729	First Come First Served
SMTP PRIORITY extension Priority Assignment Policy	RFC 6710	Specification Required (Expert: Unassigned)
SMTP Server Limits	RFC 9422	Specification Required (Expert: John Klensin, Murray Kucherawy (backup))
SMTP Service Extensions	RFC 5321	Standards Action or IESG-Approved Experimental RFC
Manufacturer Usage Description (MUD)
MUD Extensions	RFC 8520	Standards Action
MUD Well-Known Uniform Resource Name (URN)	RFC 8520	Expert Review (Expert: Eliot Lear, Dan Romascanu)
Matroska
Matroska AES Cipher Modes	RFC 9559	First Come First Served
Matroska Alpha Modes	RFC 9559	First Come First Served
Matroska Chapter Codec IDs	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Color Ranges	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Compression Algorithms	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Content Encoding Scopes	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Content Encoding Types	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Display Units	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Element IDs	RFC 9559	0x80-0xFE: RFC Required 0x407F-0x7FFE: Specification Required 0x203FFF-0x3FFFFE: First Come First Served 0x101FFFFF-0x1FFFFFFE: First Come First Served
Matroska Encryption Algorithms	RFC 9559	First Come First Served
Matroska Horizontal Chroma Sitings	RFC 9559	First Come First Served
Matroska Projection Types	RFC 9559	First Come First Served
Matroska Stereo Modes	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Tag Names	draft-ietf-cellar-tags-25	Tag Names for UTF-8 data: First Come First Served Tag Names for binary data: Specification Required Tag Names for nested tags: Specification Required
Matroska Tags Target Types	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Track Plane Types	RFC 9559	First Come First Served
Matroska Track Types	RFC 9559	Specification Required (Expert: Dave Rice, Steve Lhomme)
Matroska Vertical Chroma Sitings	RFC 9559	First Come First Served
Maximally Redundant Tree (MRT) Parameters
MRT Profile Identifier Registry	RFC 7812	Standards Action
Media Control Channel Framework Parameters
Control Packages	RFC 6230	RFC Required
Header Fields	RFC 6230	RFC Required
IVR Prompt Variable Type for Control Packages	RFC 6231	RFC Required
MEDIACTRL Interactive Voice Response Control Package Status Codes	RFC 6623	Standards Action
Method Names	RFC 6230	RFC Required
Mixer Control Package Status Code Registration	RFC 6505	Standards Action
Status Codes	RFC 6230	RFC Required
Media Feature Tags - iso.org.dod.internet.features (1.3.6.1.8)
iso.org.dod.internet.features.global-tree (1.3.6.1.8.2)	RFC 2506	Expert Review (Expert: Paul Kyzivat)
iso.org.dod.internet.features.ietf-tree (1.3.6.1.8.1)	RFC 2506 RFC 2534	IETF Review
iso.org.dod.internet.features.sip-tree (1.3.6.1.8.4)	RFC 3840	IETF Review
iso.org.dod.internet.features.uri-tree (1.3.6.1.8.3)	RFC 2506	Unregistered (formed from uri)
Media Gateway Control Protocol (MGCP)
List of Extension Digit Map Letters	RFC 3660	Expert Review (Expert: Brian Rosen)
LocalConnectionOptions Sub-registry	RFC 3435	Expert Review (Expert: Brian Rosen)
MGCP Package Sub-Registry	RFC 3435	Expert Review (Expert: Brian Rosen)
Media Independent Handover (MIH)
MIH Table of Mappings From Service Field Values to Transport Protocols	RFC 5679	Standards Action
Media Resource Control Protocol Version 2 (MRCPv2) Parameters
Grammar Reference List Parameters	RFC 6787	Specification Required (Expert: Unassigned)
MRCPv2 Header Fields	RFC 6787	Standards Action
MRCPv2 Methods and Events	RFC 6787	Standards Action
MRCPv2 Resource Types	RFC 6787	Standards Action
MRCPv2 Status Codes	RFC 6787	Specification Required (Expert: Unassigned)
MRCPv2 Vendor-Specific Parameters	RFC 6787	First Come First Served
Megaco/H.248 Packages
Error Codes	RFC 5125 RFC 5615	Expert Review (Expert: Unassigned)
Private packages (0x8000 to 0xffff)	RFC 5125 RFC 5615	Expert Review (Expert: Unassigned)
Profile Names	RFC 5125 RFC 5615	Expert Review (Expert: Unassigned)
Public Packages (0x0001-0x7fff)	RFC 5125	Expert Review or IETF Review (Expert: Unassigned)
ServiceChange Reasons	RFC 5125 RFC 5615	Expert Review (Expert: Unassigned)
Message Disposition Notification (MDN) Parameters
MDN-Disposition-modifier-names	RFC 8098	Specification Required (Expert: Tony Hansen)
MDN-Disposition-notification-option-names	RFC 8098	Specification Required (Expert: Unassigned)
MDN-Extension-field-names	RFC 8098	Specification Required (Expert: Unassigned)
Message Headers
Content-Translation-Type Header Field Values	RFC 8255	Specification Required (Expert: Nik Tomkinson)
Permanent Message Header Field Names	RFC 3864 draft-ietf-emailcore-rfc5322bis-12	Expert Review (Expert: Mark Baker (primary), Murray Kucherawy (backup))
Provisional Message Header Field Names	RFC 3864 draft-ietf-emailcore-rfc5322bis-12	Expert Review (Expert: Mark Baker (primary), Murray Kucherawy (backup))
Message Session Relay Protocol (MSRP) Parameters
Header Fields	RFC 4975	RFC Required
Methods	RFC 4975	RFC Required
Status Codes	RFC 4975	RFC Required
Message Tracking Query Protocol (MTQP) Options Registry
MTQP Options	RFC 3887	Options whose names do not begin with "vnd.": Standards Action or IESG-approved experimental RFC Options with "vnd.": First Come First Served
Messaging Abuse Reporting Format (MARF) Parameters
Feedback Report Header Fields	RFC 5965	Specification Required (Expert: Scott Kitterman, Murray Kucherawy)
Feedback Report Type Values	RFC 5965	Specification Required (Expert: Scott Kitterman, Murray Kucherawy)
Messaging Layer Security (MLS)
MLS Cipher Suites	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
MLS Credential Types	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
MLS Exporter Labels	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
MLS Extension Types	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
MLS Proposal Types	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
MLS Public Key Encryption Labels	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
MLS Signature Labels	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
MLS Wire Formats	RFC 9420	Specification Required (Expert: Sean Turner, Raphael Robert, Richard Barnes)
Milnet Parameters
Milnet Link Numbers		Registry closed
Milnet Logical Addresses		Registry closed
Milnet X.25 Address Mappings		Registry closed
Mobile Ad hoc NETwork (MANET) Parameters
Address Block TLV Types	RFC 5444 RFC 7631 RFC 8245	0-127: Expert Review 128-223: Expert Review 224-255: Reserved for Experimental Use
Cryptographic Functions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Hash Functions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
HELLO Message-Type-specific Address Block TLV Types	RFC 6130	0-127: Reserved 128-223: Expert Review 224-255: Reserved
HELLO Message-Type-specific Message TLV Types	RFC 6130	0-127: Reserved 128-223: Expert Review 224-255: Reserved
ICV Address Block TLV Type Extensions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
ICV Message TLV Type Extensions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
ICV Packet TLV Type Extensions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
LINK_METRIC Address Block TLV Type Extensions	RFC 7181	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
LINK_STATUS TLV Values	RFC 7188	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
LOCAL_IF TLV Values	RFC 7188	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Message TLV Types	RFC 5444 RFC 7631 RFC 8245	0-127: Expert Review 128-223: Expert Review 224-255: Reserved for Experimental Use
Message Types	RFC 5444 RFC 8245	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
MPR TLV BIT Values	RFC 7188	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
NBR_ADDR_TYPE Address Block TLV Bit Values	RFC 7188	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
OTHER_NEIGHB TLV Values	RFC 7188	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Packet TLV Types	RFC 5444 RFC 8245	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
SMF Relay Algorithm IDs	RFC 6621	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
SMF_NBR_TYPE Address Block TLV Type Extensions	RFC 6621	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
SMF_TYPE Message TLV Type Extensions	RFC 6621	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
TC Message-Type-specific Address Block TLV Types	RFC 7181	0-127: Reserved 128-223: Expert Review 224-255: Reserved
TC Message-Type-specific Message TLV Types	RFC 7181	0-127: Reserved 128-223: Expert Review 224-255: Reserved
TIMESTAMP Address Block TLV Type Extensions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
TIMESTAMP Message TLV Type Extensions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
TIMESTAMP Packet TLV Type Extensions	RFC 7182	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 0 Address Block TLV Type Extensions	RFC 5497 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 0 Message TLV Type Extensions	RFC 5497 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 1 Address Block TLV Type Extensions	RFC 5497 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 1 Message TLV Type Extensions	RFC 5497 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 10 Address Block TLV Type Extensions	RFC 7181 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 2 Address Block TLV Type Extensions	RFC 6130 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 3 Address Block TLV Type Extensions	RFC 6130 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 4 Address Block TLV Type Extensions	RFC 6130 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 7 Message TLV Type Extensions	RFC 7181 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 8 Address Block TLV Type Extensions	RFC 7181 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 8 Message TLV Type Extensions	RFC 7181 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Type 9 Address Block TLV Type Extensions	RFC 7181 RFC 7631	Expert Review (Expert: Justin Dean, Christoper Dearlove (backup))
Mobile IPv4 Numbers
Access Technology Types	RFC 5563	Expert Review (Expert: Unassigned)
Code Values for General Notification Messages	RFC 6098	0: Expert Review 1-63: Expert Review 64-69: Expert Review 70-127: Expert Review 128-133: Expert Review 134-191: Expert Review 192-197: Expert Review 198-255: Expert Review
Code Values for Mobile IP Handoff Reply Messages (Value 17)	RFC 4881	IETF Review
Code Values for Mobile IP Registration Reply Messages	RFC 5944 RFC 6521	(Expert: Unassigned)
Dual Stack (DSMIPv4) Extension subtypes (Value 152)	RFC 5454	Expert Review (Expert: Unassigned)
Extension Subtypes
Extensions to Mobile IP Registration Messages	RFC 5944 RFC 6098	Specification Required (Expert: Unassigned)
Generalized Link Layer Address Registration Extension Subtypes and Generalized Link Layer Address Advertisement Extension Subtypes	RFC 4881	IETF Review
IPv6 Prefix Reply Extension Codes	RFC 5454	Expert Review (Expert: Unassigned)
Message String Extension (Value 145)	RFC 4917	Expert Review (Expert: Unassigned)
Mobile IP Extensions for ICMP Router Discovery messages	RFC 5944	Specification Required (Expert: Unassigned)
Mobile IP Message Types	RFC 5944	Specification Required (Expert: Unassigned)
Mobile Network Acknowledgement Extension	RFC 5177	Standards Action or IESG Approval
Mobile Router Route Optimization Capability Extension (Value 153)	RFC 6521	RFC Required
PMIPv4 Device ID Types	RFC 5563	Expert Review (Expert: Unassigned)
PMIPv4 Non-skippable Extension (Value 47)	RFC 5563	Expert Review (Expert: Unassigned)
PMIPv4 Per-Node Authentication Method Types	RFC 5563	Expert Review (Expert: Unassigned)
PMIPv4 Skippable Extension (Value 147)	RFC 5563	Expert Review (Expert: Unassigned)
PMIPv4 Subscriber ID Types	RFC 5563	Expert Review (Expert: Unassigned)
Replay Method Identifier	RFC 3957	Expert Review (Expert: Unassigned)
Route Optimization Data Extension (Value 50)	RFC 6521	RFC Required
Route Optimization Extension (Value 49)	RFC 6521	RFC Required
Security Parameter Index (SPI) Values for the Mobile IP Reserved SPIs	RFC 4721	Must be specified and approved by the MIP4 working group
Mobile IPv6
Access Network Information (ANI) Sub-Option Type Values	RFC 6757	Expert Review (Expert: Jouni Korhonen, Sri Gundavelli)
Access Technology Type Option Type Values	RFC 5213	Expert Review (Expert: Sri Gundavelli, Jouni Korhonen)
Binding Acknowledgment Flags	RFC 5213	Standards Action or IESG Approval
Binding Revocation Acknowledgement Status Codes	RFC 5846	Standards Action or IESG Approval
Binding Revocation Type	RFC 5846	Standards Action or IESG Approval
Binding Update Flags	RFC 5213	Standards Action or IESG Approval
DSMIP6-TLS Packet Types Registry	RFC 6618	RFC Required
Dual Stack MIPv6 (DSMIPv6) IPv4 Home Address Option Status Codes	RFC 5555	IETF Review
Enumerating Algorithms	RFC 4285	IETF Review
Flow Binding Acknowledgement Status Codes	RFC 7109	RFC Required
Flow Binding Action Values	RFC 7109	RFC Required
Flow Binding Indication Triggers	RFC 7109	RFC Required
Flow Binding Type	RFC 7109	RFC Required
Flow Identification Mobility Option Status Codes	RFC 6089	Standards Action or IESG Approval
Flow Identification Sub-Options	RFC 6089	Standards Action or IESG Approval
Handoff Indicator Option Type Values	RFC 5213	Expert Review (Expert: Sri Gundavelli, Jouni Korhonen)
Handover Acknowledge Flags	RFC 5949	Standards Action or IESG Approval
Handover Acknowledge Status Codes	RFC 5949	Standards Action or IESG Approval
Handover Initiate Flags	RFC 5949	Standards Action or IESG Approval
Handover Initiate Status Codes	RFC 5949	Standards Action or IESG Approval
IPv4 DHCP Support Mode Flags	RFC 5844	Expert Review (Expert: Sri Gundavelli, Jouni Korhonen)
IPv4 Home Address Reply Status Codes	RFC 5844	Expert Review (Expert: Sri Gundavelli, Jouni Korhonen)
LMA-Controlled MAG Parameters Sub-Option Type Values	RFC 8127	Expert Review (Expert: Dhananjay Patki, Lyle Bertz)
Mobile Node Group Identifier Type Registry	RFC 6602	Expert Review (Expert: Unassigned)
Mobile Node Identifier Option Subtypes	RFC 4283	Standards Action
Mobility Header Types - for the MH Type field in the Mobility Header	RFC 6275	Standards Action or IESG Approval
Mobility Options	RFC 6275	Standards Action or IESG Approval
Operator-Identifier Type Registry	RFC 6757	Expert Review (Expert: Unassigned)
Pseudo Home Address Acknowledgement Status Codes	RFC 5726	RFC Required
Quality-of-Service Attribute Registry	RFC 7222	Specification Required (Expert: Jouni Korhonen, Sri Gundavelli)
Revocation Trigger Values	RFC 5846	Standards Action or IESG Approval
Status Codes	RFC 6275 RFC 5213	Standards Action or IESG Approval
Status Codes (DNS Update Mobility Option)	RFC 5026	Standards Action or IESG Approval
Subtype Field of the MN-HA and MN-AAA Authentication Mobility Options	RFC 4285	IETF Review
Traffic Selector Format	RFC 6089	Standards Action or IESG Approval
Update Notification Acknowledgement Status Registry	RFC 7077	Specification Required (Expert: Sri Gundavelli, Marco Liebsch)
Update Notification Reasons Registry	RFC 7077	Specification Required (Expert: Sri Gundavelli, Marco Liebsch)
Multi-threaded Routing Toolkit (MRT)
Subtype Codes	RFC 6396	New Subtype Code definitions must reference an existing Type Code to which the Subtype belongs. Subtype assignments follow the assignment rules for the Type Codes to which they belong.
Type Codes	RFC 6396	65-511: IETF Review 512-2047: Specification Required 2048-64511: First Come First Served
Multicast Acquisition
Multicast Acquisition Method Registry	RFC 6332	Specification Required (Expert: Unassigned)
Multicast Acquisition Report Block TLV Space Registry	RFC 6332	Specification Required (Expert: Unassigned)
Multicast Acquisition Status Code Space Registry	RFC 6332	Specification Required (Expert: Unassigned)
Multicast Address Dynamic Client Allocation Protocol (MADCAP) Parameters
MADCAP Error Codes	RFC 2730	IETF Review
MADCAP Feature Codes	RFC 2730	IETF Review
MADCAP Lease Identifier Types	RFC 2730	IETF Review
MADCAP Message Types	RFC 2730	IETF Review
MADCAP Options	RFC 2730	IETF Review
Multicast Address-Set Claim (MASC) Parameters
MASC Message Types	RFC 2909	IETF Review
MASC NOTIFICATION Message Error Codes and Subcodes	RFC 2909	IETF Review
MASC OPEN Message Optional Parameter Types	RFC 2909	IETF Review
MASC UPDATE Message Attribute Types	RFC 2909	IETF Review
MASC UPDATE Message Optional Parameter Types (128-255)	RFC 2909	IETF Review
Notification Error Subcodes	RFC 2909	IETF Review
Multicast Ping Protocol Parameters
Multicast Ping Protocol Message Types	RFC 6450	Specification Required (Expert: Unassigned)
Multicast Ping Protocol Option Types	RFC 6450	Specification Required (Expert: Unassigned)
Multicast Source Discovery Protocol (MSDP) TLV Values Registry
MSDP TLV Values	RFC 3618	1-200: Standards Action or IESG Approval 201-255: Experimental Use
Multimedia Internet KEYing (MIKEY) Payload Name Spaces
Cert Hash Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
Common Header Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
DH Data Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
ECC Curve	RFC 6267	Specification Required (Expert: Daniel Migault)
Envelope Data Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
Error Payload Name Spaces	RFC 3830 RFC 6309	IETF Review or IESG Approval
General Extensions Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
ID Payload and Certificate Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
ID Role	RFC 6043	Specification Required (Expert: Daniel Migault)
ID Scheme	RFC 6509	Specification Required (Expert: Daniel Migault)
Key Data Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
Key Data Transport Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
MIKEY Security Protocol Parameters	RFC 3830 RFC 6309	IETF Review or IESG Approval
RAND Role	RFC 6043	Specification Required (Expert: Daniel Migault)
SAKKE params	RFC 6509	Specification Required (Expert: Daniel Migault)
Security Policy Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
Signature Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
SK sub-payload	RFC 6267	Specification Required (Expert: Daniel Migault)
Ticket Type	RFC 6043	Specification Required (Expert: Daniel Migault)
Timestamp Payload Field Names	RFC 3830 RFC 6309	IETF Review or IESG Approval
TS Role	RFC 6043	Specification Required (Expert: Daniel Migault)
Multiplexed Application Substrate over QUIC Encryption (MASQUE)
HTTP Capsule Types	RFC 9297	provisional: Expert Review Date field update for provisional registrations: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required first unassigned codepoint: Standards Action values 0x29 * N + 0x17 (for integer values of N): Reserved
HTTP Capsule Types	RFC 9297
MASQUE URI Suffixes	RFC 9484	Expert Review (Expert: Tommy Pauly, Magnus Westerlund)
Multiprotocol Label Switching Architecture (MPLS)
Adjacency Type in the IGP-Adjacency Segment ID	RFC 8287	0-250: Standards Action 251-254: Experimental Use
Base Special-Purpose MPLS Label Values	RFC 3032 RFC 7274 RFC 9017	Standards Action
CC/CV MEP-ID TLV Registry	RFC 6428 RFC 7214	Standards Action
Downstream Detailed Mapping Address Type Registry	RFC 6426 RFC 7555 RFC 8029	Standards Action
DS Flags	RFC 8029	Standards Action
Extended Special-Purpose MPLS Label Values	RFC 7274	Standards Action
G-ACh Advertisement Protocol Application Registry	RFC 7212 RFC 7214	IETF Review
G-ACh Advertisement Protocol: Ethernet Interface Parameters	RFC 7213 RFC 7214	IETF Review or IESG Approval
G-ACh Advertisement Protocol: GAP TLV Objects (Application ID 0)	RFC 7212 RFC 7214	IETF Review
Global Flags	RFC 6425	Standards Action
Information Field and Protocol Identifier in the Q.2941 Generic Identifier	RFC 3033	0x10-0xFD: IETF Review
Interface and Label Stack and Detailed Interface and Label Stack Address Types	RFC 8029 RFC 8611	1-250: Standards Action 251-254: Experimental Use
Interface Index Flags	RFC 8611	Standards Action
Loss/Delay Measurement Control Code: Query Codes	RFC 6374 RFC 7214	IETF Review
Loss/Delay Measurement Control Code: Response Codes	RFC 6374 RFC 7214	IETF Review
LSR Capability Flags	RFC 8611	Standards Action
Measurement Timestamp Type	RFC 6374 RFC 7214	IETF Review
Message Types	RFC 8029 RFC 9041	0-191: Standards Action 192-247: RFC Required 248-251: Experimental Use 252-255: Private Use
MPLS Fault OAM Flag Registry	RFC 6427 RFC 7214	Standards Action
MPLS Fault OAM Message Type Registry	RFC 6427 RFC 7214	Standards Action
MPLS Fault OAM TLV Registry	RFC 6427 RFC 7214	0-191: Standards Action 192-247: Specification Required
MPLS Generalized Associated Channel (G-ACh) Types (including Pseudowire Associated Channel Types)	RFC 4385 RFC 5586 RFC 7026 RFC 7214	IETF Review
MPLS Loss/Delay Measurement TLV Object	RFC 6374 RFC 7214	IETF Review
MPLS Multi-Topology Identifiers	RFC 7307 RFC 8320	Standards Action
MPLS OAM Function Flags	RFC 7759	Standards Action
MPLS PSC Capability Flag Registry	RFC 7271	Standards Action
MPLS PSC Request Registry	RFC 6378 RFC 7214	Standards Action
MPLS PSC TLV Registry	RFC 6378 RFC 7214	IETF Review
MPLS RPS Request Code Registry	RFC 8227	Specification Required (Expert: Weiqiang Cheng, Jie Dong)
MPLS RTM TLV Registry	RFC 8169	0-127: IETF Review 128-191: First Come First Served
MPLS-TP DHC TLVs	RFC 8185	IETF Review
Multipath Types	RFC 8029	0-250: Standards Action 251-254: Experimental Use
Network Action Flags Without Ancillary Data	draft-ietf-mpls-mna-hdr-21	0-14: IETF Review 15-16: Experimental Use 17-19: Private Use 20-439: IETF Review
Network Action Opcodes	draft-ietf-mpls-mna-hdr-21	1-110: IETF Review 111-114: Experimental Use 115-126: Private Use 127: IETF Review
Next Hop Address Type Registry	RFC 7555	Standards Action
Pad Types	RFC 8029	1-250: Standards Action 251-254: Experimental Use
Protocol in Label Stack Sub-TLV of Downstream Detailed Mapping TLV	RFC 8287	0-250: Standards Action 251-254: Experimental Use
Protocol in the Segment ID Sub-TLV	RFC 8287	0-250: Standards Action 251-254: Experimental Use
Proxy Flags	RFC 7555	Standards Action
Q.2957 User-to-user Signaling for the Internet Protocol	RFC 3033	0x03-0xFD: IETF Review
Reply Modes	RFC 8029 RFC 9041	0-191: Standards Action 192-247: RFC Required 248-251: Experimental Use 252-255: Private Use
Reply Path Return Codes	RFC 7110	0x0000-0xFFFB: Standards Action 0xFFFC-0xFFFF: Experimental Use
Return Codes	RFC 8029 RFC 9041	0-191: Standards Action 192-247: RFC Required 248-251: Experimental Use 252-255: Private Use
Return Path Sub-TLV Types	RFC 9779	1-175: IETF Review 176-239: First Come First Served 240-251: Experimental Use 252-254: Private Use
Segment ID Sub-TLV Flags	RFC 9716	Standards Action
TLVs	RFC 8029 RFC 9041	0-16383: Standards Action 16384-31739: RFC Required 31740-31743: Experimental Use 31744-32767: First Come First Served 32768-49161: Standards Action 49162-64507: RFC Required 64508-64511: Experimental Use 64512-65535: First Come First Served
Multipurpose Internet Mail Extensions (MIME) and Media Types
Access Types	RFC 4289	RFC publication required
CMS Encapsulating Content Types	RFC 7193	Expert Review (Expert: Russ Housley, Sean Turner)
CMS Inner Content Types	RFC 7193	Expert Review (Expert: Russ Housley, Sean Turner)
Event Code Registry	RFC 4733	Specification Required (Expert: Unassigned)
Markdown Variants	RFC 7763	First Come First Served
Media Types	RFC 6838 RFC 4855	Expert Review for Vendor and Personal Trees. For Standards Tree, see RFC 6838, Section 3.1. (Expert: Alexey Melnikov, Darrel Miller, Murray Kucherawy (backup))
MIME to X.400 Table	RFC 1494	N/A
MIME to X.400 Table - Extended Body Part	RFC 1494	N/A
Parameter Values for the smime-type Parameter	RFC 7114	Specification Required (Expert: Russ Housley, Sean Turner (secondary))
Provisional Standard Media Type Registry	RFC 6838	FCFS (Organization subject to IESG Approval)
Report Types	RFC 8460	Specification Required (Expert: Murray Kucherawy)
Standards-related organizations that have registered Media Types in the Standards Tree	RFC 6838	IESG Approval
Structured Syntax Suffixes	RFC 6838	Expert Review (Expert: Alexey Melnikov, Darrel Miller)
Sub-Parameter Registry for application/aif+cbor and application/aif+json	RFC 9237	Specification Required (Expert: Göran Selander)
Sub-parameter Registry for application/mbox	RFC 4155	Specification Required (Expert: Unassigned)
Sub-Parameter Registry for audio/rtp-midi	RFC 6295	See sub-registries below
Sub-Parameter Registry for mode=rtp-midi of audio/mpeg4-generic	RFC 6295	See sub-registries below
Sub-Parameter Registry for video/raw	RFC 4175	See sub-registries below
Sub-Parameter Registry video/mpeg4-generic, audio/mpeg4-generic and application/mpeg4-generic	RFC 3640	Specification Required (Expert: Unassigned)
text/directory Parameters	RFC 2425	Two-week comment period, expert review (Expert: Rolf Sonneveld, Andrew Findlay)
text/directory Profiles	RFC 2425	Two-week comment period, expert review (Expert: Rolf Sonneveld, Andrew Findlay)
text/directory Types	RFC 2425	Two-week comment period, expert review (Expert: Rolf Sonneveld, Andrew Findlay)
Top-Level Media Types	RFC 9694	Standards Action
X.400 to MIME Table - Basic Body Parts	RFC 1494	N/A
Named Information
Named Information Hash Algorithm Registry	RFC 6920	Expert Review (Expert: James Manger)
Named Information URI Parameter Definitions	RFC 6920	Expert Review (Expert: James Manger)
Namespaces for IP over IEEE 1394
CSR Protocol Identifiers	RFC 2734	IANA allocation
MCAP (Multicast Channel Allocation Protocol) Parameters	RFC 2734 RFC 3146	Standards Action
Negative-ACKnowledgment (NACK) Oriented Reliable Multicast (NORM) Parameters
NORM Header Extension Types	RFC 5740	Specification Required (Expert: Unassigned)
NORM Stream Control Codes	RFC 5740	Specification Required (Expert: Unassigned)
NORM_CMD Message Sub-types	RFC 5740	Specification Required (Expert: Unassigned)
Netnews Parameters
Netnews Cancel-Lock Hash Algorithms	RFC 8315	First Come First Served
Network Configuration Protocol (NETCONF) Capability URNs
Capability URNs	RFC 6241 RFC 7803	IETF Review
Network File System version 4 (NFSv4)
NFSv4 ${ietf.org:CPU_ARCH} Values	RFC 8881	First Come First Served
NFSv4 ${ietf.org:OS_TYPE} Values	RFC 8881	First Come First Served
NFSv4 Device ID Notifications	RFC 8881	Standards Action with Expert Review (Expert: Unassigned)
NFSv4 Named Attribute Definitions	RFC 8881 RFC 7530	Specification Required for new registrations; updates to fields other than the contact field require Expert Review or IESG Approval (Expert: Unassigned)
NFSv4 Path Variables	RFC 8881	ietf.org domain: Standards Action with Expert Review non-ietf.org. domain: First Come First Served
NFSv4 Recallable Object Types	RFC 8881	Standards Action with Expert Review (Expert: Unassigned)
pNFS Layout Types	RFC 8881	Standards Action with Expert Review (Expert: Unassigned)
Network Layer Protocol Identifiers (NLPIDs) of Interest
NLPIDs of Interest	RFC 6328	IETF Review
Network News Transfer Protocol (NNTP) Parameters
NNTP Capability Labels	RFC 3977	Labels beginning with X are reserved for private use. All others: Standards Track RFC or an IESG-approved experimental protocol.
NNTP Compression Algorithms	RFC 8054	First Come First Served
Network Service Header (NSH) Parameters
Flow ID Context Types	RFC 9263	IETF Review
Forwarding Context Types	RFC 9263	IETF Review
NSH Base Header Bits	RFC 8300	Standards Action
NSH IETF-Assigned Optional Variable-Length Metadata Types	RFC 8300	Standards Action
NSH MD Class	RFC 8300	0x0000-0x01FF: IETF Review 0x0200-0xFFF5: Expert Review
NSH MD Types	RFC 8300	IETF Review
NSH Next Protocol	RFC 8300	Expert Review (Expert: Carlos Pignataro, Joel Halpern, Jim Guichard)
NSH Version	RFC 8300	Standards Action
Network Time Protocol (NTP) Parameters
NTP Extension Field Types	RFC 5905 RFC 5906 RFC 9748	Specification Required (Expert: Kurt Kristof Teichel, Miroslav Lichvar, David Venhoek)
NTP Kiss-o'-Death Codes	RFC 5905 RFC 9748	Specification Required (Expert: Kurt Kristof Teichel, Miroslav Lichvar, David Venhoek)
NTP Reference Identifier Codes	RFC 5905 RFC 9748	Specification Required (Expert: Kurt Kristof Teichel, Miroslav Lichvar, David Venhoek)
Network Time Security (NTS)
Network Time Security Error Codes	RFC 8915	0-1023: IETF Review 1024-32767: Specification Required 32768-65535: Private or Experimental Use
Network Time Security Key Establishment Record Types	RFC 8915	0-1023: IETF Review 1024-16383: Specification Required 16384-32767: Private or Experimental Use
Network Time Security Next Protocols	RFC 8915	0-1023: IETF Review 1024-32767: Specification Required 32768-65535: Private or Experimental Use
Network Time Security Warning Codes	RFC 8915	0-1023: IETF Review 1024-32767: Specification Required 32768-65535: Private or Experimental Use
Network Virtualization Overlay (NVO3)
Geneve Option Class	RFC 8926	0x0000-0x00FF: IETF Review 0x0100-0xFEFF: First Come First Served 0xFF00-0xFFFF: Experimental Use
Next Hop Resolution Protocol (NHRP) Types
NHRP Extension Types	RFC 2332	Expert Review (Expert: Jim Luciani)
NHRP Packet Types	RFC 2332	Expert Review (Expert: Jim Luciani)
Novell Service Advisor Protocol (SAP) Numbers - Novell Object Types
Novell Object Type		IANA does not assign
NSIS Signaling Layer Protocol (NSLP) Parameters
AUTH_ENT_ID (X-Type 1) SubType values	RFC 5981	Specification Required (Expert: Unassigned)
DEST_ADDR (X-Type 4) SubType values	RFC 5981	Specification Required (Expert: Unassigned)
END_TIME (X-Type 6) SubType values	RFC 5981	Specification Required (Expert: Unassigned)
Informational Error Codes	RFC 5974	0-63: IETF Review 64-127: Specification Required
NATFW NSLP Header Flags	RFC 5973	IETF Review
NATFW NSLP Message Types	RFC 5973	IETF Review
NATFW Response Codes	RFC 5973	IETF Review
NSLP Error Classes	RFC 5974 RFC 5973	IETF Review
NSLP Message Objects	RFC 5974	1-1023: IETF Review 1024-1999: Specification Required
Permanent Failure Codes	RFC 5974	0-63: IETF Review 64-127: Specification Required
Protocol Error Codes	RFC 5974	0-63: IETF Review 64-127: Specification Required
QoS Model Error Codes	RFC 5975	Specification Required (Expert: Unassigned)
QoS NSLP Binding Codes	RFC 5974	IETF Review
QoS NSLP Error Source Identifiers	RFC 5974	Specification Required (Expert: Unassigned)
QoS NSLP Message Types	RFC 5974	IETF Review
SESSION_AUTH X-Types	RFC 5981	Specification Required (Expert: Unassigned)
SOURCE_ADDR (X-Type 3) SubType values	RFC 5981	Specification Required (Expert: Unassigned)
START_TIME (X-Type 5) SubType values	RFC 5981	Specification Required (Expert: Unassigned)
Success Error Codes	RFC 5974	0-63: IETF Review 64-127: Specification Required
Transient Failure Codes	RFC 5974	0-63: IETF Review 64-127: Specification Required
OAuth Parameters
OAuth Access Token Types	RFC 6749 RFC 8414	Specification Required (Expert: Hannes Tschofenig, Mike Jones)
OAuth Authorization Endpoint Response Types	RFC 6749	Specification Required (Expert: Hannes Tschofenig, Mike Jones)
OAuth Authorization Server Metadata	RFC 8414	Specification Required (Expert: Mike Jones, Nat Sakimura, John Bradley, Dick Hardt)
OAuth Dynamic Client Registration Metadata	RFC 7591	Specification Required (Expert: Justin Richer)
OAuth Extensions Error Registry	RFC 6749	Specification Required (Expert: Hannes Tschofenig, Mike Jones)
OAuth Parameters	RFC 6749	Specification Required (Expert: Hannes Tschofenig, Mike Jones)
OAuth Protected Resource Metadata	RFC 9728	Specification Required (Expert: Michael Jones, Dick Hardt)
OAuth Token Endpoint Authentication Methods	RFC 7591 RFC 8414	Specification Required (Expert: Justin Richer)
OAuth Token Introspection Response	RFC 7662	Specification Required (Expert: Justin Richer)
OAuth Token Type Hints	RFC 7009	Specification Required (Expert: Torsten Lodderstedt, Mike Jones)
OAuth URI	RFC 6755	Specification Required (Expert: Hannes Tschofenig, Mike Jones)
PKCE Code Challenge Methods	RFC 7636	Specification Required (Expert: John Bradley, Mike Jones)
One Time Password (OTP) Parameters
Algorithm Identifier	RFC 2289	IESG Approval
Extension Set Identifiers	RFC 2243	IESG Approval
One-Way Active Measurement Protocol (OWAMP) Parameters
OWAMP-Control Command Numbers	RFC 7718	IETF Review
OWAMP-Modes	RFC 7718	IETF Review
Open Pluggable Edge Services (OPES)
OPES Callout Protocol (OCP) Core	RFC 4037	Expert Review for standards-track registration
Open Shortest Path First (OSPF)
Bandwidth Constraints Model Identifiers	RFC 4124	0-239: Specification Required 240-255: Reserved for Private Use
Open Shortest Path First (OSPF) Authentication Codes
Authentication Codes	RFC 2328 RFC 6549	IETF Review
Open Shortest Path First (OSPF) Link Local Signalling (LLS) - Type/Length/Value Identifiers (TLV)
Link Local Signalling TLV Identifiers (LLS Types)	RFC 5613	IETF Review
LLS Type 1 Extended Options and Flags	RFC 5613	Expert Review (Expert: Gunter Van De Velde, Peter Psenak)
Open Shortest Path First (OSPF) Multi-Topology Routing
Multi-Topology ID Values	RFC 4915	0-2: Reserved 3-31: IETF Review 32-127: Reserved 128-255: Reserved
Open Shortest Path First (OSPF) Opaque Link-State Advertisements (LSA) Option Types
Opaque Link-State Advertisements (LSA) Option Types	RFC 5250	0-127: IETF Review 128-255: Private Use
OSPFv2 TTZ LSA TLVs	RFC 8099	IETF Review
Open Shortest Path First (OSPF) Parameters
OSPF Dynamic Flooding LSA TLVs	draft-ietf-lsr-dynamic-flooding-18	IETF Review or IESG Approval
OSPF Flex-Algorithm Prefix Metric Bits	RFC 9350	IETF Review
OSPF Flexible Algorithm Definition TLV Sub-TLVs	RFC 9350	IETF Review or IESG Approval
OSPF Link Attributes Sub-TLV Bit Values	draft-ietf-lsr-dynamic-flooding-18	IETF Review or IESG Approval
OSPF Router Functional Capability Bits	RFC 7770	IETF Review
OSPF Router Information (RI) TLVs	RFC 7770	1-32767: IETF Review 32768-32777: Experimentation 32778-65535: Reserved
OSPF Router Informational Capability Bits	RFC 7770	IETF Review
OSPF Tunnel Parameter Sub-TLVs	RFC 9013	1-34999: Standards Action 35000-65499: First Come First Served
Open Shortest Path First (OSPF) Signature Algorithms
Signature Algorithms	RFC 2154	IETF Review
Open Shortest Path First (OSPF) Traffic Engineering TLVs
RFC 4973 Experimental TE LSA Types	RFC 4973	IETF Review
RFC 4973 Experimental TE TLVs	RFC 4973	IETF Review
Top Level Types in TE LSAs	RFC 3630	Standards Action
Types for sub-TLVs of Optical Node Property (Value 6)	RFC 7688	Standards Action
Types for sub-TLVs of OTN-TDM SCSI (Switching Capability Specific Information)	RFC 7138	Standards Action
Types for sub-TLVs of Router Address TLV (Value 1)	RFC 6827	Standards Action
Types for sub-TLVs of TE Link TLV (Value 2)	RFC 3630	Standards Action
Types for sub-TLVs of TE Node Attribute TLV (Value 5)	RFC 5786	Standards Action
Types for sub-TLVs of WSON-LSC SCSI (Switching Capability Specific Information)	RFC 7688	Standards Action
Open Shortest Path First v2 (OSPFv2) Parameters
IP Algorithm Prefix Reachability Sub-TLV Flags	RFC 9502	IETF Review or IESG Approval
OSPF Packet Type (both v2 and v3)	RFC 2328 RFC 4940	1-127: Standards Action 128-255: Reserved
OSPFv2 Extended Inter-Area ASBR Sub-TLVs	RFC 9350	IETF Review or IESG Approval
OSPFv2 Extended Inter-Area ASBR TLVs	RFC 9350	IETF Review or IESG Approval
OSPFv2 Extended Link Opaque LSA TLVs	RFC 7684	IETF Review or IESG Approval
OSPFv2 Extended Link TLV Sub-TLVs	RFC 7684 RFC 9356	IETF Review or IESG Approval
OSPFv2 Extended Prefix Opaque LSA TLVs	RFC 7684	IETF Review or IESG Approval
OSPFv2 Extended Prefix TLV Flags	RFC 7684	IETF Review or IESG Approval
OSPFv2 Extended Prefix TLV Sub-TLVs	RFC 7684	IETF Review or IESG Approval
OSPFv2 Grace LSA Top Level TLV	RFC 4940	1-255: Standards Action 256-65519: Reserved 65520-65527: Experimentation 65528-65535: Vendor Private Use
OSPFv2 Instance IDs	RFC 6549	Standards Action
OSPFv2 Link State (LS) Type	RFC 2328 RFC 4940	1-127: Standards Action 128-255: Reserved
OSPFv2 Options Registry (8 bits)	RFC 4940	Standards Action
OSPFv2 Prefix Extended Flags	RFC 9792	IETF Review
OSPFv2 Router LSA Link Type (Value 1)	RFC 4940	1-127: Standards Action 128-255: Reserved
OSPFv2 Router Properties Registry	RFC 4940	Standards Action
Open Shortest Path First v3 (OSPFv3) Authentication Trailer Options
OSPFv3 Authentication Types	RFC 7166	Standards Action
Open Shortest Path First v3 (OSPFv3) Parameters
LD Options	RFC 5820	IETF Review
OSPFv3 Autoconfiguration (AC) LSA TLVs	RFC 7503	IETF Review or IESG Approval
OSPFv3 Extended-LSA Sub-TLVs	RFC 8362 RFC 9356	4-32767: IETF Review or IESG Approval 33024-45055: First Come First Served
OSPFv3 Extended-LSA TLVs	RFC 8362	9-32767: IETF Review or IESG Approval 33024-45055: First Come First Served
OSPFv3 Instance ID Address Family Values	RFC 5838 RFC 6969	Standards Action
OSPFv3 LSA Function Codes	RFC 7770	0-255: IETF Review 256-8175: Reserved 8176-8183: Experimentation 8184-8190: Vendor Private Use 8191: Reserved
OSPFv3 Options (24 bits)	RFC 4940	Standards Action
OSPFv3 Prefix Extended Flags	RFC 9792	IETF Review
OSPFv3 Prefix Options (8 bits)	RFC 4940	Standards Action
OSPFv3 Router LSA Link Types	RFC 4940	0-127: Standards Action 128-255: Reserved
OSPFv3 Router Properties Registry	RFC 5340	Standards Action
OSPFv3 SRv6 Adjacency SID Sub-TLV Flags	RFC 9513	Standards Action
OSPFv3 SRv6 Capabilities TLV Flags	RFC 9513	Standards Action
OSPFv3 SRv6 End SID Sub-TLV Flags	RFC 9513	Standards Action
OSPFv3 SRv6 Locator LSA Sub-TLVs	RFC 9513	0-32767: IETF Review or IESG Approval 33024-45055: First Come First Served
OSPFv3 SRv6 Locator LSA TLVs	RFC 9513	0-32767: IETF Review or IESG Approval 33024-45055: First Come First Served
Open Systems Interconnection (OSI) Network Service Access Point Addresses (NSAPA) Internet Code Point Registry
OSI NSAPA Internet Code Points for AFI 35	RFC 4548	IETF Review
OpenPGP
OpenPGP AEAD Algorithms	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Armor Header Keys	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Armor Header Lines	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Compression Algorithms	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP ECC Curve OIDs and Usage	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP ECC Curve-Specific Wire Formats	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP ECDH KDF and KEK Parameters	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Elliptic Curve Point Wire Formats	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Elliptic Curve Scalar Encodings	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Encrypted Message Packet Versions	RFC 9580	RFC Required
OpenPGP Features Flags	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Hash Algorithm Identifiers for RSA Signatures' Use of EMSA-PKCS1-v1_5 Padding	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Hash Algorithms	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Image Attribute Encoding Format	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Image Attribute Versions	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Key and Signature Versions	RFC 9580	RFC Required
OpenPGP Key Flags	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Key IDs and Fingerprints	RFC 9580	RFC Required
OpenPGP Key Server Preference Flags	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP New Packet Versions (OBSOLETE)	RFC 9580	Registry closed
OpenPGP Packet Types	RFC 9580	RFC Required
OpenPGP Public Key Algorithms	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Reason for Revocation (Revocation Octet)	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Secret Key Encryption (S2K Usage Octet)	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Signature Notation Data Subpacket Notation Flags	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Signature Notation Data Subpacket Types	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Signature Subpacket Types	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Signature Types	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP String-to-Key (S2K) Types	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP Symmetric Key Algorithms	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
OpenPGP User Attribute Subpacket Types	RFC 9580	Specification Required (Expert: Daniel Kahn Gillmor, Andrew Gallagher, Heiko Schäfer)
Operating System Names
Operating System Names	RFC 952	First Come First Served
OS Specific Fact Names	RFC 3659	First Come First Served
OS Specific Filetypes	RFC 3659	First Come First Served
Optimized Link State Routing (OLSR) Protocol Message Types
OLSR Protocol Message Types	RFC 3626	1-127: Standards Action 128-255: Private/Local Use
Opus Channel Mapping Families
Opus Channel Mapping Families	RFC 7845 RFC 8486	Specification Required (Expert: Tim Terriberry, Ralph Giles)
OSPF Database Description (DD) Packet Flags
Database Description (DD) Packet Flags	RFC 5838	Standards Action
Packet CAPture (PCAP)
PCAP-Related LinkTypes	draft-ietf-opsawg-pcaplinktype-18	0-65000: Expert Review 65001-65535: Experimental Use
Packet Sampling (PSAMP) Parameters
PSAMP selectorAlgorithm Identifiers	RFC 5476	Expert Review (Expert: Unassigned)
PAL Package Types
PAL Package Types	RFC 8295	Expert Review (Expert: Sean Turner)
Path Computation Element Protocol (PCEP) Numbers
ASSOCIATION Flag Field	RFC 8697 RFC 9756	IETF Review
ASSOCIATION Type Field	RFC 8697 RFC 9756	IETF Review
AUTO-BANDWIDTH-ATTRIBUTES Sub-TLV Types	RFC 8733	0-65503: IETF Review 65504-65535: Experimental Use
AUTO-BANDWIDTH-CAPABILITY TLV Flag Field	RFC 8733 RFC 9756	IETF Review
Bidirectional LSP Association Group TLV Flag Field	RFC 9059 RFC 9756	IETF Review
BPI Object Error Code Field	RFC 9757	IETF Review
BPI Object Flag Field	RFC 9757	IETF Review
BPI Object Status Code Field	RFC 9757	IETF Review
BU Object Type Field	RFC 8233 RFC 9756	IETF Review
CCI Object Flag Field for MPLS Label	RFC 9050 RFC 9756	IETF Review
CCI Object Flag Field for Native IP	RFC 9757	IETF Review
CLOSE Object Flag Field	RFC 5440	IETF Review
CLOSE Object Reason Field	RFC 5440	IETF Review
DISJOINTNESS-CONFIGURATION TLV Flag Field	RFC 8800 RFC 9756	IETF Review
Domain-ID TLV Domain Type	RFC 8685	IETF Review
FLOWSPEC Object Flag Field	RFC 9168 RFC 9756	IETF Review
Generalized Endpoint Types	RFC 8779 RFC 9756	0-244: IETF Review 245-255: Experimental Use
GMPLS-CAPABILITY TLV Flag Field	RFC 8779 RFC 9756	IETF Review
H-PCE-CAPABILITY TLV Flag Field	RFC 8685 RFC 9756	IETF Review
H-PCE-FLAG TLV Flag Field	RFC 8685 RFC 9756	IETF Review
Inter-Layer Object Path Property Bits	RFC 8282	IETF Review
IRO Subobjects	RFC 5521	IETF Review
LOAD-BALANCING Object Flag Field	RFC 5440	IETF Review
LSP Exclusion Subobject Flag Field	RFC 9504 RFC 9756	IETF Review
LSP Object Flag Field	RFC 8231 RFC 9756	IETF Review
LSP-ERROR-CODE TLV Error Code Field	RFC 8231 RFC 9756	IETF Review
LSP-EXTENDED-FLAG TLV Flag Field	RFC 9357 RFC 9756	IETF Review
LSPA Object Flag Field	RFC 5440	IETF Review
METRIC Object Flag Field	RFC 5440	IETF Review
METRIC Object T Field	RFC 5440	IETF Review
MONITORING Object Flag Field	RFC 5886	IETF Review
NO-PATH Object Flag Field	RFC 5440	IETF Review
NO-PATH Object NI Field	RFC 5440	IETF Review
NO-PATH-VECTOR TLV Flag Field	RFC 5440	IETF Review
Notification Object	RFC 5440	IETF Review
Notification Object Flag Field	RFC 5440	IETF Review
Objective Function	RFC 5541	1-1023: IETF Review 1024-32767: First Come First Served 32768-65535: Reserved for Private Use
Open Object Flag Field	RFC 5440	IETF Review
OVERLOAD Object Flag field	RFC 5886	IETF Review
Path Protection Association Group TLV Flag Field	RFC 8745 RFC 9756	IETF Review
PATH-KEY Subobjects	RFC 5520	IETF Review
PATH-MODIFICATION TLV Flag Field	draft-ietf-pce-circuit-style-pcep-extensions-16	IETF Review
PATH-SETUP-TYPE-CAPABILITY Sub-TLV Type Indicators	RFC 8664 RFC 9756	IETF Review
PCECC-CAPABILITY sub-TLV	RFC 9050 RFC 9756	IETF Review
PCEP Flow Specification TLV Type Indicators	RFC 9168	0-255: Reserved 256-64506: Specification Required 64507-65531: First Come First Served 65532-65535: Experimental Use
PCEP Message Common Header Flag Field	RFC 5440	IETF Review
PCEP Messages	RFC 5440	0-251: IETF Review 252-255: Experimental Use
PCEP Objects	RFC 5440	0-247: IETF Review 248-255: Experimental Use
PCEP Path Setup Types	RFC 8408	IETF Review
PCEP SR-ERO NAI Types	RFC 8664	IETF Review
PCEP SRv6-ERO NAI Types	RFC 9603	IETF Review
PCEP TLV Type Indicators	RFC 5440	0-65503: IETF Review 65504-65535: Experimental Use
PCEP-ERROR Object Error Types and Values	RFC 5440 RFC 9756	0-251: IETF Review 252-255: Experimental Use
PCEP-ERROR Object Flag Field	RFC 5440	IETF Review
PROC-TIME Object Flag Field	RFC 5886	IETF Review
RP Object Flag Field	RFC 5440	IETF Review
S2LS Object Flag Field	RFC 8623 RFC 9756	IETF Review
SCHED-PD-LSP-ATTRIBUTE TLV Opt Field	RFC 8934 RFC 9756	IETF Review
Schedule TLVs Flag Field	RFC 8934 RFC 9756	IETF Review
SR Capability Flag Field	RFC 8664 RFC 9756	IETF Review
SR Policy Capability TLV Flag Field	RFC 9862	IETF Review
SR Policy Invalidation Configuration Flags	RFC 9862	IETF Review
SR Policy Invalidation Operational Flags	RFC 9862	IETF Review
SR-ERO Flag Field	RFC 8664 RFC 9756	IETF Review
SRP Object Flag Field	RFC 8281 RFC 8786 RFC 9756	IETF Review
SRv6 Capability Flag Field	RFC 9603 RFC 9756	IETF Review
SRv6-ERO Flag Field	RFC 9603 RFC 9756	IETF Review
STATEFUL-PCE-CAPABILITY TLV Flag Field	RFC 8231 RFC 9756	IETF Review
SVEC Object Flag Field	RFC 5440	IETF Review
TE-PATH-BINDING TLV BT Field	RFC 9604 RFC 9756	IETF Review
TE-PATH-BINDING TLV Flag Field	RFC 9604 RFC 9756	IETF Review
WA Object Flag Field	RFC 8780 RFC 9756	IETF Review
Wavelength Allocation TLV Flag Field	RFC 8780 RFC 9756	IETF Review
Wavelength Restriction TLV Action Values	RFC 8780 RFC 9756	IETF Review
XRO Flag Field	RFC 5521	IETF Review
XRO Subobjects	RFC 5521	IETF Review
Peer-to-Peer Streaming Peer Protocol (PPSPP)
PPSP Peer Protocol Chunk Addressing Method Registry	RFC 7574	IETF Review
PPSP Peer Protocol Content Integrity Protection Method Registry	RFC 7574	IETF Review
PPSP Peer Protocol Merkle Hash Tree Function Registry	RFC 7574	IETF Review
PPSP Peer Protocol Message Type Registry	RFC 7574	IETF Review
PPSP Peer Protocol Option Registry	RFC 7574	IETF Review
PPSP Peer Protocol Version Number Registry	RFC 7574	IETF Review
Peer-to-Peer Streaming Tracker Protocol (PPSTP)
PPSTP Error Code Registry	RFC 7846	IETF Review
PPSTP Request Type Registry	RFC 7846	IETF Review
PPSTP Version Number Registry	RFC 7846	IETF Review
Per Hop Behavior Identification Codes
Per Hop Behavior Identification Codes	RFC 3140	Expert or area director review (Expert: Primary: Brian Carpenter; Secondary: David Black)
Performance Metrics
Performance Metric Name Elements - Method	RFC 8911	Specification Required (Expert: Greg Mirsky, Michael Scharf)
Performance Metric Name Elements - Metric Type	RFC 8911	Specification Required (Expert: Greg Mirsky, Michael Scharf)
Performance Metric Name Elements - Output	RFC 8911	Specification Required (Expert: Greg Mirsky, Michael Scharf)
Performance Metric Name Elements - Spec	RFC 8911	Specification Required (Expert: Greg Mirsky, Michael Scharf)
Performance Metric Name Elements - SubTypeMethod	RFC 8911	Specification Required (Expert: Greg Mirsky, Michael Scharf)
Performance Metric Name Elements - Units	RFC 8911	Specification Required (Expert: Greg Mirsky, Michael Scharf)
Performance Metrics Registry	RFC 8911	Specification Required (Expert: Greg Mirsky, Michael Scharf)
Permanent IPv6 Multicast Group Identifiers
Group Identifier Values	RFC 3307	Expert Review (Expert: Stig Venaas)
Point-to-Point (PPP) Protocol Field Assignments
IP Header Compression Configuration Option Suboption Types	RFC 3544	Standards Action
IP-Compression-Protocol Types	RFC 1332	IETF Review
IPv6-Compression-Protocol Types	RFC 5172	IETF Review
NetBIOS Frames Control Protocol (NBFCP) Configuration Options	RFC 2097	Expert Review (Expert: James Carlson)
PPP (IPXCP) Configuration Options	RFC 1552	Expert Review (Expert: James Carlson)
PPP ATCP Configuration Option Types	RFC 1378	Expert Review (Expert: James Carlson)
PPP Authentication Algorithms	RFC 1994	Expert Review (Expert: James Carlson)
PPP Banyan Vines Configuration Option Types	RFC 1763	Expert Review (Expert: James Carlson)
PPP Bridging Configuration Option Types	RFC 3518 RFC 3818	IETF Review
PPP Bridging MAC Types	RFC 3518 RFC 3818	IETF Review
PPP Bridging Spanning Tree	RFC 3518 RFC 3818	IETF Review
PPP CCP Configuration Option Types	RFC 1962 RFC 3818	IETF Review
PPP DLL Protocol Numbers	RFC 1661 RFC 3818	0xxx-3xxx: IETF Review 4xxx-7xxx: IETF Review 8xxx-bxxx: IETF Review cxxx-fxxx: IETF Review
PPP EAP Request/Response Types	RFC 3748	Expert Review
PPP ECP Configuration Option Types	RFC 1968	Expert Review (Expert: James Carlson)
PPP IPCP Configuration Option Types	RFC 1332 RFC 3818	IETF Review
PPP IPv6CP Configuration Options	RFC 5072 RFC 3818	IETF Review
PPP LCP Callback Operation Fields	RFC 1570 RFC 3818	IETF Review
PPP LCP Configuration Option Types	RFC 1661 RFC 3818	IETF Review
PPP LCP FCS-Alternatives	RFC 1570 RFC 3818	IETF Review
PPP Link Control Protocol (LCP) and Internet Protocol Control Protocol (IPCP) Codes	RFC 1661 RFC 3818	IETF Review
PPP Multilink Endpoint Discriminator Class	RFC 1990 RFC 3818	IETF Review
PPP OSINLCP Configuration Option Types	RFC 1377	Expert Review (Expert: James Carlson)
PPP Over Ethernet Versions	RFC 2516 RFC 8822	Specification Required (Expert: Donald Eastlake)
PPP SDCP Configuration Options	RFC 1963	Expert Review (Expert: James Carlson)
PPP TNCP Configuration Option Types	RFC 6361	IETF Review
PPP Vendor Specific OUI Options	RFC 5342	Registry closed by RFC 5342
ROHC Configuration Option Suboption Identifier Values	RFC 3241
Point-to-Point Over Ethernet (PPPoE) Parameters
PPPoE Active Discovery Code fields (8-bit values)	RFC 4937	First Come First Served
PPPoE TAG Values (16-bit values)	RFC 4937	First Come First Served
Port Control Protocol (PCP) Parameters
PCP Opcodes	RFC 6887	0-31, 127: Standards Action 32-63: Specification Required
PCP Options	RFC 6887	0-63, 127-191, 255: Standards Action 64-95, 192-223: Specification Required
PCP Result Codes	RFC 6887	0-127, 255: Standards Action 128-191: Specification Required
Portable Symmetric Key Container (PSKC)
Algorithm URI Registry and Related PSKC Profiles	RFC 6030	Specification Required (Expert: Unassigned)
Key Usage Registry	RFC 6030	Expert Review (Expert: Unassigned)
PSKC Version Registry	RFC 6030	Standards Action
Post Office Protocol version 3 (POP3) Extension Mechanism
POP3 Capabilities	RFC 2449	Standards Track or IESG-approved Experimental RFC
POP3 Response Codes	RFC 2449	RFC Specification Required
Post-Stack First Nibble
Post-Stack First Nibble	RFC 9790	Standards Action
Posture Attribute (PA) Protocol Compatible with Trusted Network Connect (TNC) Parameters
PA-TNC Attribute Types	RFC 5792	Specification Required (Expert: Steve Hanna, Jessica Fitzgerald-McKay, Charles Schmidt)
PA-TNC Error Codes	RFC 5792	Specification Required (Expert: Steve Hanna, Jessica Fitzgerald-McKay, Charles Schmidt)
PA-TNC Remediation Parameters Types	RFC 5792	Specification Required (Expert: Steve Hanna, Jessica Fitzgerald-McKay, Charles Schmidt)
Software Data Model Types	RFC 8412	Specification Required (Expert: David Waltermire, Jessica Fitzgerald-McKay)
Posture Broker (PB) Protocol Compatible with Trusted Network Connect (TNC) Parameters
PA Subtypes	RFC 5793	Specification Required (Expert: Steve Hanna, Jessica Fitzgerald-McKay, Charles Schmidt)
PB-TNC Error Codes	RFC 5793	Specification Required (Expert: Steve Hanna, Jessica Fitzgerald-McKay, Charles Schmidt)
PB-TNC Message Types	RFC 5793	Specification Required (Expert: Steve Hanna, Jessica Fitzgerald-McKay, Charles Schmidt)
PB-TNC Remediation Parameters Types	RFC 5793	Specification Required (Expert: Steve Hanna, Jessica Fitzgerald-McKay, Charles Schmidt)
Power State Sets
DMTF Power State Set	RFC 7326	Expert Review (Expert: Unassigned)
EMAN Power State Set	RFC 7326	Expert Review (Expert: Unassigned)
IEEE1621 Power State Set	RFC 7326	Expert Review (Expert: Unassigned)
PRECIS Derived Property Value
PRECIS Derived Property Value	RFC 8264 RFC 5892	Expert Review (Expert: Patrik Fältström)
Preparation and Comparison of Internationalized Strings (PRECIS) Parameters
PRECIS Base Classes	RFC 8264	RFC Required
PRECIS Profiles	RFC 8264	Expert Review (Expert: Peter Saint-Andre (primary), Pete Resnick (secondary), Andrew Sullivan (backup))
Presence SRV Protocol Label Registry
Presence SRV Protocol Labels	RFC 3861	Specification Required (Expert: Unassigned)
Printer MIB Interpreters Language Families - OBSOLETE
Printer MIB Interpreters Language Families - OBSOLETE	RFC 3805	Expert Review (Expert: Ira McDonald, Michael Sweet)
Privacy Enhanced RTP Conferencing (PERC)
Datagram Transport Layer Security (DTLS) Tunnel Protocol Message Types for Privacy Enhanced Conferencing	RFC 9185	IETF Review
Privacy Pass
Privacy Pass Token Types	RFC 9577	Specification Required (Expert: Tommy Pauly, Chris Wood)
Probabilistic Routing Protocol using History of Encounters and Transitivity (PRoPHET)
Bundle Offer and Response B Flags	RFC 6693	Specification Required (Expert: Unassigned)
Bundle Offer and Response TLV Flags	RFC 6693	Specification Required (Expert: Unassigned)
DTN Routing Protocol Number	RFC 6693	Specification Required (Expert: Unassigned)
Error TLV Flags	RFC 6693	Specification Required (Expert: Unassigned)
Hello TLV Flags 0, 1, 2	RFC 6693	Specification Required (Expert: Unassigned)
Hello TLV Flags 3-7	RFC 6693	Specification Required (Expert: Unassigned)
PRoPHET Codes for Failure	RFC 6693	Specification Required (Expert: Unassigned)
PRoPHET Codes for Success	RFC 6693	Specification Required (Expert: Unassigned)
PRoPHET Header Flags	RFC 6693	Specification Required (Expert: Unassigned)
PRoPHET Protocol Version	RFC 6693	Specification Required (Expert: Unassigned)
PRoPHET Result Field	RFC 6693	Specification Required (Expert: Unassigned)
PRoPHET TLV Type	RFC 6693	Specification Required (Expert: Unassigned)
RIB Dictionary TLV Flags	RFC 6693	Specification Required (Expert: Unassigned)
RIB Flags	RFC 6693	Specification Required (Expert: Unassigned)
RIB TLV Flags	RFC 6693	Specification Required (Expert: Unassigned)
Profile URIs
Profile URIs	RFC 7284	First Come First Served (Specification Suggested)
Pronet 80 Type Numbers
Pronet 80 Type Numbers		IANA does not assign
Protocol for Carrying Authentication for Network Access (PANA) Parameters
AVP Codes	RFC 5191 RFC 6786	Expert Review with Specification Required, or Standards Action (Expert: Alper Yegin)
AVP Flags	RFC 5191 RFC 5872	Standards Action or IESG Approval
Message Flags	RFC 5191 RFC 5872	Standards Action or IESG Approval
Message Types	RFC 5191 RFC 5872	1-65519: IETF Review or IESG Approval 65520-65535: IANA does not assign
Protocol Independent Multicast (PIM) Parameters
PIM Address Encoding Types	RFC 5384 RFC 7761 RFC 7887	IETF Review
PIM Address Family	RFC 3973 RFC 7761	IESG Approval
PIM Designated Router Load-Balancing Hash Algorithms	RFC 8775	IETF Review
PIM Flooding Mechanism Message Types	RFC 8364	IETF Review
PIM Join Attribute Types	RFC 5384	IETF Review
PIM Join/Prune Transport Types	RFC 8059	IETF Review
PIM Message Types	RFC 9436	IETF Review
PIM-Hello Options	RFC 7761 RFC 3973	First Come First Served (expire in 1 year); Specification Required for Permanent assignments (Expert: Stig Venaas, Jeffrey (Zhaohui) Zhang)
PORT Message Types	RFC 6559	RFC Required
PORT Option Types	RFC 6559	RFC Required
Protocol Numbers
Assigned Internet Protocol Numbers	RFC 5237 RFC 7045	IESG Approval or Standards Action
Protocol to Access White-Space (PAWS)
PAWS Error Code Registry	RFC 7545	Specification Required (Expert: Unassigned)
PAWS Parameters Registry	RFC 7545	Specification Required (Expert: Unassigned)
PAWS Ruleset ID Registry	RFC 7545	Specification Required (Expert: Unassigned)
Provisioning Domains (PvDs)
Additional Information PvD Keys	RFC 8801	Expert Review (Expert: Tommy Pauly, David Schinazi)
PvD Option Flags	RFC 8801	Standards Action
PvD Split DNS Claims	RFC 9704	Expert Review (Expert: Tommy Pauly, Tirumaleswar Reddy.K, Benjamin M. Schwartz)
Proxy Certificate Policy Languages
Proxy Certificate Policy Languages	RFC 3820	IETF Standards Action
Pseudowire Name Spaces (PWE3)
Associated Channel Header TLV Registry (DELETED)	RFC 5586 RFC 7026
Attachment Group Identifier (AGI) Type Registry	RFC 4446	2-64: Expert Review 65-127: IETF Review 128-254: First Come First Served 255: IETF Review
Attachment Individual Identifier Type Registry	RFC 4446	2-64: Expert Review 65-127: IETF Review 128-254: First Come First Served 255: IETF Review
CC/CV MEP-ID TLV Registry	RFC 6428 RFC 7214
G-ACh Advertisement Protocol Application Registry	RFC 7212 RFC 7214
G-ACh Advertisement Protocol TLV Registry	RFC 7212 RFC 7214
G-ACh Advertisement Protocol: Ethernet Interface Parameters	RFC 7213 RFC 7214
Header Compression Over MPLS PW Control Word Packet Type	RFC 4901	Expert Review
ICC RG Parameter Types	RFC 7275	0x0000: IETF Review 0x003B-0x1FFF: Expert Review 0x2000-0x2FFF: IETF Review 0x3000-0x3FFE: First Come First Served 0x3FFF: IETF Review
L2VPN PE Stack Capabilities	RFC 6575	IETF Review
MPLS Pseudowire Types Registry	RFC 4446	31-1024: Expert Review 1025-4096: IETF Review 4097-32766: First Come First Served 32767: IETF Review
MPLS VCCV Connectivity Verification (CV) Types	RFC 5085	IETF Review
MPLS VCCV Control Channel (CC) Types	RFC 5085	IETF Review
Pseudowire Associated Channel Types	RFC 4385 RFC 5586 RFC 7026 RFC 7214
Pseudowire Interface Parameters Sub-TLV type Registry	RFC 4446	2-64: Expert Review 65-127: IETF Review 128-254: First Come First Served 255: IETF Review
Pseudowire Status Codes Registry	RFC 4446	Expert Review (Expert: Stewart Bryant, Andrew Malis, Matthew Bocci)
Pseudowire Switching Point PE sub-TLV Type	RFC 6073	0: IETF Review 1-64: Expert Review 65-127: IETF Review 128-254: First Come First Served 255: IETF Review
PSN Tunnel Sub-TLV Name Space	RFC 7965	IETF Review
PW Generic Protocol Flags	RFC 6478	IETF Review
PW Status Refresh Reduction Configuration Message Sub-TLVs	RFC 8237	0x00: IETF Review 0x04-0x40: Expert Review 0x41-0x7F: IETF Review 0x80-0xFE: Expert Review 0xFF: IETF Review
PW Status Refresh Reduction Control Messages	RFC 8237	0x00: IETF Review 0x03-0x40: Expert Review 0x41-0x7F: IETF Review 0x80-0xFE: Expert Review 0xFF: IETF Review
PW Status Refresh Reduction Message Flags	RFC 8237	IETF Review
PW Status Refresh Reduction Notification Codes	RFC 8237	0x00000000: IETF Review 0x00000008-0x00010000: Expert Review 0x00010001-0x08000000: IETF Review 0x08000001-0xFFFFFFFE: Expert Review 0xFFFFFFFF: IETF Review
VCCV Extended CV Types	RFC 7189	IETF Review
PT-EAP: Posture Transport (PT) Protocol For EAP Tunnel Methods
PT-EAP Versions	RFC 7171	Standards Action
Public Data Network Numbers
Public Data Network Numbers	RFC 1356	Registrations no longer accepted
Public Key Infrastructure using X.509 (PKIX) Parameters
Certification Authority Restriction Flags	RFC 8659	RFC Required
Certification Authority Restriction Properties	RFC 8659	Specification Required (Expert: Phillip Hallam-Baker)
PKIX SRV Protocol Labels	RFC 4386	Specification Required (Expert: Unassigned)
Public Notary Transparency
Error Types	RFC 9162	Specification Required (Expert: Unassigned)
Hash Algorithms	RFC 9162	0x00-0xDF: Specification Required 0xE0-0xEF: Experimental Use 0xF0-0xFF: Private Use
Log Artifact Extensions	RFC 9162	0x0000-0xDFFF: Specification Required 0xE000-0xEFFF: Experimental Use 0xF000-0xFFFF: Private Use
Log IDs	RFC 9162	First Come First Served
Signature Algorithms	RFC 9162	0x0000-0x0807: Specification Required 0x0808-0xFDFF: Expert Review 0xFE00-0xFEFF: Experimental Use 0xFF00-0xFFFF: Private Use
VersionedTransTypes	RFC 9162	0x0100-0xDFFF: Specification Required 0xE000-0xEFFF: Experimental Use 0xF000-0xFFFF: Private Use
QoS NSIS Signal Layering Protocol (NSLP) QSPEC Parameters
Excess Treatment Parameter	RFC 5975	Specification Required (Expert: Unassigned)
Extent of Restoration Field	RFC 5976	Specification Required (Expert: Unassigned)
Object Types	RFC 5975	Specification Required (Expert: Unassigned)
Parameter ID	RFC 5975	Specification Required (Expert: Unassigned)
QSPEC Procedure	RFC 5975	Specification Required (Expert: Unassigned)
QSPEC Type	RFC 5975	Specification Required (Expert: Unassigned)
QSPEC Version	RFC 5975	Specification Required (Expert: Unassigned)
Restoration Priority Field	RFC 5976	Specification Required (Expert: Unassigned)
Time to Restore Field	RFC 5976	Specification Required (Expert: Unassigned)
Y.1541 QoS Class Parameter	RFC 5975	Specification Required (Expert: Unassigned)
Y.2171 Admission Priority Parameter	RFC 5975	Specification Required (Expert: Unassigned)
QUIC
QUIC Frame Types	RFC 9000	provisional: Expert Review provisional registration Date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required first unassigned codepoint: Standards Action
QUIC Transport Error Codes	RFC 9000	provisional: Expert Review provisional registration Date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required first unassigned codepoint: Standards Action
QUIC Transport Parameters	RFC 9000	provisional: Expert Review provisional registration Date field update: First Come First Served permanent, 0x00-0x3f: Standards Action or IESG Approval permanent, greater than 0x3f: Specification Required first unassigned codepoint: Standards Action values 31 * N + 27 (for integer values of N): Reserved
QUIC Versions	RFC 9000	provisional: Expert Review provisional registration Date field update: First Come First Served permanent: Specification Required first unassigned codepoint: Standards Action value 0x?a?a?a?a: Reserved
Radius Types
Code Values for RADIUS Attribute 241.1, Frag-Status	RFC 7499	RFC Required
Data Type	RFC 8044	Standards Action
Entity Types (Attribute 127, Location-Information)	RFC 5580	Expert Review (Expert: Alan DeKok, Mohit Sethi)
Location Profiles (Attribute 127, Location-Information)	RFC 5580	Expert Review (Expert: Alan DeKok, Mohit Sethi)
Location-Capable Attribute (Attribute 131)	RFC 5580	Expert Review (Expert: Alan DeKok, Mohit Sethi)
Operator Namespace Identifier for Attribute 126	RFC 5580	Expert Review (Expert: Alan DeKok, Mohit Sethi)
Option Codes Permitted in the Softwire46-Priority Attribute	RFC 8658	IETF Review
Privacy Flags (Attribute 129, Basic-Location-Policy-Rules)	RFC 5580	Expert Review (Expert: Alan DeKok, Mohit Sethi)
RADIUS Attribute Types	RFC 3575 RFC 6929 RFC 8044	1-191: IETF Review 192-240: Reserved for Private Use 224-240: Implementation Specific 241-246 (extended space, Unassigned): IETF Review 241-246 (extended space, Reserved): Standards Action 247-255: Reserved
RADIUS IP Port Configuration and Reporting TLVs	RFC 8045	Standards Action
RADIUS Packet Type Codes	RFC 3575	IESG Approval
RADIUS Softwire46 Configuration and Multicast Attributes	RFC 8658	Standards Action
Requested-Location-Info Attribute (Attribute 132)	RFC 5580	Expert Review (Expert: Alan DeKok, Mohit Sethi)
Values for RADIUS Attribute 10, Framed-Routing	RFC 2865 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 101, Error-Cause Attribute	RFC 3575 RFC 5176 RFC 7930	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 13, Framed-Compression	RFC 2865 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 133, Framed-Management-Protocol Attribute	RFC 5607	Specification Required (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 134, Management-Transport-Protection Attribute	RFC 5607	Specification Required (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 15, Login-Service	RFC 2865 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 29, Termination-Action	RFC 2865 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 40, Acct-Status-Type	RFC 2866 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 45, Acct-Authentic	RFC 2866 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 49, Acct-Terminate-Cause	RFC 2866 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 6, Service-Type	RFC 2865 RFC 3575	IETF Review
Values for RADIUS Attribute 61, NAS-Port-Type	RFC 2865 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 64, Tunnel-Type	RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 65, Tunnel-Medium-Type	RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 7, Framed-Protocol	RFC 2865 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 72, ARAP-Zone-Access	RFC 2869 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Values for RADIUS Attribute 76, Prompt	RFC 2869 RFC 3575	Expert Review (Expert: Alan DeKok, Margaret Cullen)
Real Time Streaming Protocol (RTSP)/1.0 Parameters
RTSP/1.0 Headers	RFC 2326	Standards Document, preferably an IETF RFC
RTSP/1.0 Methods	RFC 2326	Standards Action
RTSP/1.0 Option Tags	RFC 2326	Specification Required (Expert: Unassigned)
RTSP/1.0 Status Codes	RFC 2326	Standards Action
Real-time Inter-network Defense (RID)
RID Enumeration List	RFC 6545	Expert Review (Expert: Unassigned)
XML Schemas Exchanged via RID	RFC 6545	Specification Required (Expert: Unassigned)
Real-Time Streaming Protocol (RTSP) 2.0 Parameters
Accept-Credentials Hash Algorithms	RFC 7826	Standards Action
Accept-Credentials Policies	RFC 7826	Standards Action
Cache-Control Cache Directive Extensions	RFC 7826	Standards Action or IESG Approval
Feature-tags	RFC 7826	First Come First Served
Media Properties	RFC 7826	Specification Required (Expert: Martin Stiemerling)
Notify-Reason Values	RFC 7826	Specification Required (Expert: Martin Stiemerling)
Range Header Formats	RFC 7826	Specification Required (Expert: Martin Stiemerling)
RSTP 2.0 Headers	RFC 7826	Expert Review (Expert: Martin Stiemerling)
RTP-Info Header Parameters	RFC 7826	Specification Required (Expert: Martin Stiemerling)
RTSP 2.0 Methods	RFC 7826	Standards Action
RTSP 2.0 Status Codes	RFC 7826	IETF Review
Seek-Style Policies	RFC 7826	Specification Required (Expert: Martin Stiemerling)
Terminate-Reason Header Parameters	RFC 7826	Specification Required (Expert: Martin Stiemerling)
Terminate-Reason Redirect Reasons	RFC 7826	Expert Review (Expert: Martin Stiemerling)
Transport Modes	RFC 7826	Standards Action
Transport Parameters	RFC 7826	Specification Required (Expert: Martin Stiemerling)
Transport Protocol Identifier	RFC 7826	Specification Required (Expert: Martin Stiemerling)
Real-Time Transport Protocol (RTP) Parameters
EKT Ciphers	RFC 8870	Specification Required (Expert: Unassigned)
EKT Message Types	RFC 8870	Specification Required (Expert: Unassigned)
FMT Values for PSFB Payload Types	RFC 4585	Specification Required (Expert: Magnus Westerlund)
FMT Values for RTPFB Payload Types	RFC 4585	Specification Required (Expert: Magnus Westerlund)
RAMS Response Code Space Registry	RFC 6285	1xx: Informational 2xx: Success 3xx: Redirection 4xx: RTP Receiver (RTP_Rx) Error 5xx: Burst/Retransmission Source (BRS) Error
RAMS TLV Space Registry	RFC 6285	Specification Required (Expert: Unassigned)
RTCP Control Packet Types (PT)	RFC 5761 RFC 3550	1-191: Specification Required or Expert Review 194-199: Specification Required or Expert Review 200-223: Specification Required or Expert Review 224-254: Specification Required or Expert Review
RTP Compact Header Extensions	RFC 8285	Expert Review (Expert: Magnus Westerlund)
RTP Payload Format Media Types	RFC 4855 RFC 9751	Registry closed
RTP Payload Types (PT) for standard audio and video encodings - Closed	RFC 3551	Registry closed; see RFC 3551, Section 3
RTP Profile Names	RFC 3550	Standards Action or Expert Review (Expert: Unassigned)
RTP SDES Compact Header Extensions	RFC 7941	Expert Review (Expert: Magnus Westerlund)
RTP SDES Item Types	RFC 3550	Specification Required or Expert Review (Expert: Magnus Westerlund)
SFMT Values for RAMS Messages	RFC 6285	Specification Required (Expert: Unassigned)
SMT Values for TOKEN Packet Type Registry	RFC 6284	IETF Review
Sub-Report Block Type (SRBT) Values for the RSI Packet	RFC 5760	Specification Required (Expert: Unassigned)
Realm Specific IP (RSIP) Parameters
RSIP Address Types	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
RSIP Error Codes	RFC 3103	Specification Required (Expert: Unassigned)
RSIP Local Flow Policies	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
RSIP Message Types	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
RSIP Methods	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
RSIP Parameters	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
RSIP Remote Flow Policies	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
RSIP Tunnel Types	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
RSIP Vendor IDs	RFC 3103	0: Reserved 1-240: Specification Required 241-255: Private Use
Realtime Traffic Flow Measurement (RTFM)
Pattern Matching Engine (PME) Opcodes	RFC 2722	IETF Review
RTFM Attributes	RFC 2722	0-511: IETF Review 512-1023: First Come First Served 1024 and above: Reserved for Private Use
Registrar IDs
Registrar IDs		Assigned by ICANN
Registration Data Access Protocol (RDAP)
Bootstrap Service Registry for AS Number Space	RFC 9224
Bootstrap Service Registry for Domain Name Space	RFC 9224
Bootstrap Service Registry for IPv4 Address Space	RFC 9224
Bootstrap Service Registry for IPv6 Address Space	RFC 9224
Bootstrap Service Registry for Provider Object Tags	RFC 8521
RDAP Extensions	RFC 7480	Specification Required (Expert: Jasdip Singh, Scott Hollenbeck)
RDAP JSON Values	RFC 9083 RFC 9537	Expert Review (Expert: Jasdip Singh, Scott Hollenbeck)
RDAP Provider Object Tags	RFC 8521	First Come First Served
RDAP Reverse Search	RFC 9536	Specification Required (Expert: Jasdip Singh, Scott Hollenbeck)
RDAP Reverse Search Mapping	RFC 9536	Specification Required (Expert: Jasdip Singh, Scott Hollenbeck)
Registration Data Access Protocol (RDAP) Query Purpose Values	RFC 9560	Specification Required (Expert: Scott Hollenbeck, Andrew Newton, Mario Loffredo, Pawel Kowalik, Jasdip Singh)
Registry for the Session Initiation Protocol (SIP) NAPTR Resource Record Services Field
SIP Table of Mappings From Service Field Values to Transport Protocols	RFC 3263	Standards Action
Relay User Equipment (RUE)
RUE Provider List	RFC 9248	Expert Review (Expert: Brian Rosen)
Reliable Multicast Transport (RMT) FEC Encoding IDs and FEC Instance IDs
FEC Framework (FECFRAME) FEC Encoding IDs	RFC 6363	IETF Review
ietf:rmt:fec:encoding - Fully-Specified FEC schemes (0-127)	RFC 5052	IETF Review
ietf:rmt:fec:encoding - Under-Specified FEC schemes (128-255)	RFC 5052	IETF Review
Reliable Server Pooling (RSerPool) Parameters
Aggregate Server Access Protocol (ASAP) Message Types	RFC 5352	Specification Required (Expert: Unassigned)
Endpoint Handlespace Redundancy Protocol (ENRP) Message Types	RFC 5353	Specification Required (Expert: Unassigned)
RSerPool Error Causes	RFC 5354	Specification Required (Expert: Unassigned)
RSerPool Parameter Types	RFC 5354	Specification Required (Expert: Unassigned)
RSerPool Policy Types	RFC 5356	Specification Required (Expert: Unassigned)
Update Action Types	RFC 5353	Specification Required (Expert: Unassigned)
Remote Attestation Procedures (RATS)
Entity Attestation Token (EAT) Intended Uses	RFC 9711	Expert Review (Expert: Giridhar Mandyam, Jeremy O'Donoghue)
RATS Conceptual Message Wrapper (CMW) Indicators	draft-ietf-rats-msg-wrap-22	IETF Review
Remote Direct Data Placement
RDMA-CM Private Data Identifiers	RFC 8797	Specification Required (Expert: Chuck Lever (primary), Tom Talpey (secondary))
Remote Direct Data Placement (RDDP)
DDP Errors	RFC 6580	Standards Action
MPA Errors	RFC 6580	Standards Action
RDMAP DDP Untagged Queue Numbers	RFC 7306	Standards Action
RDMAP Errors	RFC 6580	Standards Action
RDMAP Message Atomic Operation Subcodes	RFC 7306	Standards Action
RDMAP Message Operation Codes	RFC 6580	Standards Action
SCTP Function Codes for DDP Stream Session Control	RFC 6580	Standards Action
Remote Framebuffer (RFB)
Remote Framebuffer Client-to-Server Message Types	RFC 6143	Expert Review (Expert: Tristan Richardson)
Remote Framebuffer Encoding Types	RFC 6143	Expert Review (Expert: Tristan Richardson, John Levine)
Remote Framebuffer Security Types	RFC 6143	Expert Review (Expert: Tristan Richardson)
Remote Framebuffer Server-to-Client Message Types	RFC 6143	Expert Review (Expert: Tristan Richardson)
Remote Procedure Call (RPC)
Network Identifier (r_netid)	RFC 7530	Informational RFC
ONC RPC Netids (First Come First Served)	RFC 5665	First Come First Served
ONC RPC Netids (Standards Action)	RFC 5665	Standards Action
ONC RPC Uaddr Format Registry	RFC 5665	First Come First Served or Standards Action
Protocol family (r_nc_protofmly)	RFC 1833	Standards Action
Protocol name (r_nc_proto)	RFC 1833	Standards Action
RPC Authentication Flavor Numbers	RFC 5531	First Come First Served
RPC Authentication Status Numbers	RFC 5531	First Come First Served
RPCSEC_GSS Structured Privilege Names Registry	RFC 7861	Standards Action
Transport semantics (r_nc_semantics)	RFC 1833	Standards Action
Remote Procedure Call (RPC) Program Numbers
RPC Program Numbers	RFC 5531	Up to 100 numbers: First Come First Served 101-1000 numbers: Specification Required More than 1000 numbers: IESG Approval
Reputation Parameters
Reputation Applications	RFC 7071	IETF Review or Specification Required (Expert: Unassigned)
Reserved IPv6 Interface Identifiers
Reserved IPv6 Interface Identifiers	RFC 5453 RFC 7136	Standards Action
REsource LOcation And Discovery (RELOAD)
CoAP Usage for RELOAD Access Control Policy	RFC 7650	Specification Required (Expert: Unassigned)
RELOAD Access Control Policies	RFC 6940	Standards Action
RELOAD Application-ID	RFC 6940	1-32767: Standards Action 32768-61440: Expert Review
RELOAD Data Kind-ID	RFC 6940	0x00000001-0x7fffffff: Standards Action 0x8000000-0xf0000000: Expert Review
RELOAD Data Model	RFC 6940	Standards Action
RELOAD Diagnostic Kind ID	RFC 7851	Standards Action
RELOAD Diagnostics Flag	RFC 7851	Standards Action
RELOAD Error Codes	RFC 6940	Standards Action
RELOAD Extensions Registry	RFC 6940	Specification Required (Expert: Marc Petit-Huguenin (primary), Cullen Jennings (secondary))
RELOAD Forwarding Option Registry	RFC 6940	01-127: Standards Action 128-254: Specification Required
RELOAD Message Codes	RFC 6940	Standards Action
RELOAD Overlay Algorithm Types	RFC 6940	IETF Review
RELOAD Overlay Link Protocol Registry	RFC 6940	Standards Action
RELOAD Overlay Link Registry	RFC 6940	Standards Action
RELOAD Probe Information Type Registry	RFC 6940	Standards Action
RELOAD Services Registry	RFC 7374	Specification Required (Expert: Unassigned)
Resource Public Key Infrastructure (RPKI)
BGPsec Algorithm Suites	RFC 8608	Standards Action
BGPsec Capability	RFC 8205	Standards Action
BGPsec_Path Flags	RFC 8205	Standards Action
RPKI Repository Name Schemes	RFC 6481	IETF Review
RPKI Signed Objects	RFC 6488	Standards Action
rpki-rtr-afi	draft-ietf-sidrops-8210bis-10	Expert Review (Expert: Unassigned)
rpki-rtr-error	RFC 6810	Expert Review (Expert: Keyur Patel (Primary), John G. Scudder (Secondary))
rpki-rtr-pdu	RFC 6810	RFC Required (Standards Track or Experimental)
Resource Reservation Protocol (RSVP) Parameters
Call Attributes Flags	RFC 6001	RFC Required
Call Attributes TLV	RFC 6001	RFC Required
Capability Object values	RFC 5063	Standards Action
Class Names, Class Numbers, and Class Types	RFC 3936	0-119: Standards Action 120-123: Expert Review 124-127: Reserved for Private Use 128-183: Standards Action 184-187: Expert Review 188-191: Reserved for Private Use 192-247: Standards Action 248-251: Expert Review 252-255: Reserved for Private Use
CONDITIONS Object Flags	RFC 9705	IETF Review
Error Codes and Globally-Defined Error Value Sub-Codes	RFC 3936	0-239: Standards Action 240-251: Expert Review 252-255: Reserved for Private Use
Interface Id Error specification
Message Types	RFC 3936	0-239: Standards Action 240-255: Expert Review
VCAT Elementary Signal Registry	RFC 6344	IETF Review
VCAT VCG Operation Actions	RFC 6344	IETF Review
Virtual Destination Ports	RFC 2207	0: Reserved 1-10: Reserved 11-8191: Not Defined 8192-65535: Dynamic
Resource Reservation Protocol-Traffic Engineering (RSVP-TE) Parameters
Attribute Flags	RFC 5420 RFC 7570	IETF Review
Attributes TLV Space	RFC 5420 RFC 7570	IETF Review
Record Route Object Sub-object Flags	RFC 3209	Standards Action
RTM_SET Object Sub-Object Types	RFC 8169	0-127: IETF Review 128-191: First Come First Served
Session Attribute Object Flags	RFC 4859	IETF Review
Sub-TLV Types for WSON Processing Hop Attribute TLV	RFC 7689	Standards Action or Specification Required (Expert: Unassigned)
Values for Wavelength Assignment Method field in WavelengthSelection Sub-TLV	RFC 7689	Standards Action or Specification Required (Expert: Unassigned)
Resource-Oriented Lightweight Information Exchange (ROLIE) URN Parameters
ROLIE Information Types	RFC 8322	Specification Required (Expert: David Waltermire, Stephen Banghart)
ROLIE URN Parameters	RFC 8322	Specification Required (Expert: David Waltermire, Stephen Banghart)
RESTCONF Capability URNs
RESTCONF Capability URNs	RFC 8040	IETF Review
RObust Header Compression (ROHC) Profile Identifiers
Profile Identifiers	RFC 5795	Specification Required (Expert: Unassigned)
RObust Header Compression (ROHC) Suboption Identifier Values
ROHC Configuration Option Suboption Identifier Values	RFC 3241	0-127: Standards Action 128-254: Specification Required
Roughtime
Roughtime Tags	draft-ietf-ntp-roughtime-19	Specification Required
Roughtime Versions	draft-ietf-ntp-roughtime-19	0x01-0x0x7fffffff: IETF Review 0x80000000-0xbfffffff: Experimental Use 0xc0000000-0xffffffff: Private Use
Route Distinguisher Type Field
Route Distinguisher Type Field	RFC 4364	0-32767: First Come First Served 32768-65535: IETF Review
Routing in Fat Trees (RIFT)
RIFT Security Algorithms	RFC 9692	Specification Required (Expert: Tony Przygienda)
RIFT Well-Known Key Sub-Types	draft-ietf-rift-kv-tie-structure-and-processing-09	Expert Review (Expert: Unassigned)
RIFTCommonAddressFamilyType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonHierarchyIndications	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonIEEE8021ASTimeStampType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonIPAddressType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonIPPrefixType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonIPv4PrefixType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonIPv6PrefixType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonKVTypes	RFC 9692 draft-ietf-rift-kv-tie-structure-and-processing-09	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonPrefixSequenceType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonRouteType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonTieDirectionType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTCommonTIETypeType	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingCommunity	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingKeyValueTIEElement	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingKeyValueTIEElementContent	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingLIEPacket	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingLinkCapabilities	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingLinkIDPair	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingNeighbor	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingNodeCapabilities	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingNodeFlags	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingNodeNeighborsTIEElement	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingNodeTIEElement	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingPacketContent	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingPacketHeader	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingPrefixAttributes	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingPrefixTIEElement	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingProtocolPacket	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingTIDEPacket	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingTIEElement	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingTIEHeader	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingTIEHeaderWithLifeTime	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingTIEID	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingTIEPacket	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTEncodingTIREPacket	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
RIFTVersions	RFC 9692	Minor change (per RFC9692, Section 7): Expert Review All other allocations: Specification Required
Routing Information Protocol (RIP) Parameters
RIP Address Family Identifiers	RFC 1058	Not defined
RIP Authentication Type	RFC 1388	Not defined
RIP Commands	RFC 1723	Not defined
RIP Update Headers	RFC 1058	Not Defined
RIPNG Commands	RFC 2080	Not defined
RIPNG Update Headers	RFC 2080	Not defined
Routing Protocol for Low Power and Lossy Networks (RPL)
Consistency Check (CC) Flags	RFC 6550	IETF Review
Destination Advertisement Object (DAO) Acknowledgment Flags	RFC 6550	IETF Review
Destination Advertisement Object (DAO) Flags	RFC 6550	IETF Review
Destination Cleanup Object (DCO) Flags	RFC 9009	IETF Review
Destination Cleanup Object Acknowledgment (DCO) Acknowledgment Flags	RFC 9009	IETF Review
DODAG Configuration Option Flags for MOP 0..6	RFC 6550 RFC 9008	IETF Review
DODAG Information Object (DIO) Flags	RFC 6550	IETF Review
DODAG Informational Solicitation (DIS) Flags	RFC 6550	IETF Review
Mode of Operation	RFC 6550 RFC 9008	IETF Review
Objective Code Point (OCP)	RFC 6550	IETF Review
PDR-ACK Acceptance Status Values	RFC 9914	Standards Action
PDR-ACK Rejection Status Values	RFC 9914	Standards Action
Per-KIM Security Levels	RFC 6550	IETF Review
Projected DAO Request (P-DAO-REQ) Flags	RFC 9914	Standards Action
Projected DAO Request Acknowledgment (PDR-ACK) Flags	RFC 9914	Standards Action
RPL Control Codes	RFC 6550	IETF Review
RPL Control Message Options	RFC 6550	IETF Review
RPL Non-Rejection Status	RFC 9010	IETF Review
RPL Option Flags	RFC 9914	Standards Action
RPL Rejection Status	RFC 9010	IETF Review
RPL Target Option Flags	RFC 6550 RFC 9010	IETF Review
Security Section Algorithm	RFC 6550	IETF Review
Security Section Flags	RFC 6550	IETF Review
Sibling Information Option (SIO) Flags	RFC 9914	Standards Action
Solicited Information Option Flags	RFC 6550	IETF Review
Transit Information Option Flags	RFC 6550	IETF Review
Via Information Options (VIO) Flags	RFC 9914	Standards Action
Routing Protocol for Low Power and Lossy Networks (RPL) Routing Metric/Constraint
Hop-Count Object Flag field	RFC 6551	IETF Review
Node Type Field	RFC 6551	IETF Review
NSA Object Flag field	RFC 6551	IETF Review
Routing Metric/Constraint Common Header A field	RFC 6551	IETF Review
Routing Metric/Constraint Common Header Flag field	RFC 6551	IETF Review
Routing Metric/Constraint TLVs	RFC 6551	First Come First Served
Routing Metric/Constraint Type	RFC 6551	IETF Review
RSVP-TE OAM Configuration Registry
BFD Configuration Sub-TLV Types	RFC 7487	IETF Review
Ethernet Sub-TLVs Sub-Registry	RFC 7369	IETF Review
MPLS OAM Configuration Sub-TLV Types	RFC 7487	IETF Review
OAM Function Flags Sub-Registry	RFC 7260	IETF Review
OAM Sub-TLVs	RFC 7260	0-31: IETF Review 32-65533: IETF Review 65534-65535: Reserved for Experimental Use
OAM Types	RFC 7260	IETF Review
Performance Monitoring Sub-TLV Types	RFC 7487	IETF Review
RTP Control Protocol Extended Reports (RTCP XR) Block Type Registry
IDMS XR Block SPST Registry	RFC 7272	Specification Required (Expert: Unassigned)
RTCP XR Block Type	RFC 3611	Specification Required (Expert: Joerg Ott)
RTCP XR MOS Metric block - multimedia application Calculation Algorithm	RFC 7266	Specification Required (Expert: Unassigned)
RTCP XR PDV block - PDV type	RFC 6798	Specification Required (Expert: Unassigned)
RTP Control Protocol Extended Reports (RTCP XR) Session Description Protocol (SDP) Parameters Registry
RTCP XR SDP Parameters	RFC 3611	Specification Required (Expert: Joerg Ott)
Scalable Adaptive Multicast (SAM) Baseline
SAM ALM Algorithm IDs	RFC 7019	Expert Review (Expert: Marc Petit-Huguenin (primary), Thomas Schmidt, John Buford)
SAM ALM Error Codes	RFC 7019	Expert Review (Expert: Marc Petit-Huguenin (primary), Thomas Schmidt, John Buford)
SAM ALM Message Codes	RFC 7019	Expert Review (Expert: Marc Petit-Huguenin (primary), Thomas Schmidt, John Buford)
Secret Key Transaction Authentication for DNS (TSIG) Algorithm Names
TSIG Algorithm Names	RFC 8945	IETF Review
Secure Shell (SSH) Protocol Parameters
Authentication Method Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Channel Connection Failure Reason Codes and Descriptions	RFC 4250 RFC 9519	0x00000001-0xFDFFFFFF: Expert Review 0xFE000000-0xFFFFFFFF: Reserved for Private Use
Compression Algorithm Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Connection Protocol Channel Request Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Connection Protocol Channel Types	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Connection Protocol Global Request Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Connection Protocol Subsystem Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Disconnection Messages Reason Codes and Descriptions	RFC 4250 RFC 9519	0x00000001-0xFDFFFFFF: Expert Review 0xFE000000-0xFFFFFFFF: Reserved for Private Use
Encryption Algorithm Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Extended Channel Data Transfer data_type_code and Data	RFC 4250 RFC 9519	0x00000001-0xFDFFFFFF: Expert Review 0xFE000000-0xFFFFFFFF: Reserved for Private Use
Extension Names	RFC 8308 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Key Exchange Method Names	RFC 4250 RFC 9142 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
MAC Algorithm Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Message Numbers	RFC 4250	Standards Action
Pseudo-Terminal Encoded Terminal Modes	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Public Key Algorithm Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Publickey Subsystem Attributes	RFC 4819 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Publickey Subsystem Request Names	RFC 4819 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Publickey Subsystem Response Names	RFC 4819 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Publickey Subsystem Status Codes	RFC 4819	0-191: Standards Action 192-255: Reserved for Private Use
Service Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Signal Names	RFC 4250 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
SSH Agent Extension Request Names	draft-ietf-sshm-ssh-agent-16	Expert Review (Expert: Unassigned)
SSH Agent Key Constraint Extension Names	draft-ietf-sshm-ssh-agent-16	Expert Review (Expert: Unassigned)
SSH Agent Key Constraint Numbers	draft-ietf-sshm-ssh-agent-16	Expert Review (Expert: Unassigned)
SSH Agent Protocol Message Type Numbers	draft-ietf-sshm-ssh-agent-16	0-239: Expert Review 240-255: Private Use
SSH Agent Signature Flags	draft-ietf-sshm-ssh-agent-16	Expert Review (Expert: Unassigned)
SSH Public-Key File Header Tags	RFC 4716 RFC 9519	Expert Review (Expert: Peter Yee, Markus Stenberg)
Security Event Token (SET)
Security Event Token Error Codes	RFC 8935	Specification Required (Expert: Mike Jones, John Bradley)
Subject Identifier Formats	RFC 9493	Specification Required (Expert: Prachi Jain)
Security External Enumeration Registry
Security External Enumeration Registry	RFC 7495	Specification Required (Expert: Unassigned)
Security Label Format Selection
Security Label Format Selection Registry	RFC 7569	Specification Required (Expert: Unassigned)
Security Parameters Index (SPI) Parameters
Security Parameters Index (SPI)	RFC 1826 RFC 2402 RFC 2406 RFC 4302 RFC 4303	RFC Required
security.txt Fields
security.txt Fields	RFC 9116	Expert Review (Expert: Yakov Shafranovich, Edwin Foudil)
Segment Routing
Segment Types	RFC 9256	Specification Required (Expert: Ketan Talaulikar, Matthew Bocci)
SR Policy ENLP Values	RFC 9830	Standards Action
SR Policy Protocol-Origin	RFC 9857	1-250: Expert Review 251-255: Private Use
SRv6 Endpoint Behaviors	RFC 8986	0: Reserved 1-32767: First Come First Served 32768-34815: Private Use 34816-65534: Reserved 65535: Reserved
Selective P-Multicast Service Interface (S-PMSI) Parameters
S-PMSI Join Message Type Field	RFC 6513	IETF Review
Semantic Definition Format (SDF)
SDF Feature Names	RFC 9880	Specification Required (Expert: Ari Keranen (primary), Michael Koster (backup))
SDF Quality Name Prefixes	RFC 9880	Expert Review (Expert: Ari Keranen (primary), Michael Koster (backup))
SDF Quality Names	RFC 9880	Specification Required (Expert: Ari Keranen (primary), Michael Koster (backup))
sdfType Values	RFC 9880	Specification Required (Expert: Ari Keranen (primary), Michael Koster (backup))
Sender Policy Framework (SPF) Parameters
Modifier Names	RFC 6652	Specification Required (Expert: Unassigned)
Sensor Measurement Lists (SenML)
Secondary Units	RFC 8798	Expert Review (Expert: Ari Keränen)
SenML Features	RFC 9100	Specification Required (Expert: Ari Keränen (primary), Carsten Bormann (secondary))
SenML Labels	RFC 8428	Expert Review (Expert: Ari Keränen)
SenML Units	RFC 8428	Expert Review (Expert: Ari Keränen)
Server Cache Synchronization Protocol (SCSP) Parameters
Protocol IDs	RFC 2334	RFC, product of standards body, or Expert Review
Service Function Chaining (SFC) Active Operations, Administration, and Maintenance (OAM)
SF Identifier Types	RFC 9516	0-191: IETF Review 192-251: First Come First Served 252-254: Private Use
SFC Active OAM Message Types	RFC 9516	0-31: IETF Review 32-62: First Come First Served
SFC Active OAM TLV Types	RFC 9516	0-175: IETF Review 176-239: First Come First Served 240-251: Experimental Use 252-254: Private Use
SFC Echo Reply Modes	RFC 9516	0-175: IETF Review 176-239: First Come First Served 240-251: Experimental Use 252-254: Private Use
SFC Echo Request Flags	RFC 9516	Standards Action
SFC Echo Return Codes	RFC 9516	0-191: IETF Review 192-251: First Come First Served 252-254: Private Use
SFC Echo Types	RFC 9516	0-175: IETF Review 176-239: First Come First Served 240-251: Experimental Use 252-254: Private Use
Service Function Chaining Service Function Types
Service Function Chaining Service Function Types	RFC 9015	1-31: Standards Action 32-64495: First Come First Served 64496-65534: Private Use
Service Location Protocol (SLP) Remote Service Discovery
SLP Remote Service Discovery	RFC 3832	Expert Review (Expert: Unassigned)
Service Location Protocol Version 2 (SLPv2) Cryptographic BSD Codes
Cryptographic BSD Codes	RFC 2608	IETF Review
Service Location Protocol Version 2 (SLPv2) Registrations
Service Location Protocol, Version 2 (SLPv2) Templates	RFC 2609	Expert Review (Expert: Erik Guttman)
SLPv2 Extension IDs	RFC 2608	Expert Review (Expert: Erik Guttman)
Service Location Protocol, Version 2 (SLPv2) Error Numbers
Error Numbers	RFC 2608	Standards Action
Service Location Protocol, Version 2 (SLPv2) Function IDs
Function IDs	RFC 2608	IETF Review
Service Names and Transport Protocol Port Numbers
Service Name and Transport Protocol Port Number Registry	RFC 6335	(Expert: TCP/UDP: Joe Touch; Eliot Lear, Kumiko Ono, Wes Eddy, Brian Trammell, and Michael Scharf SCTP: Michael Tuexen DCCP: Eddie Kohler and Yoshifumi Nishida)
Session Description Protocol (SDP) Parameters
"ack" and "nack" Attribute Values	RFC 4585 RFC 8859	First Come First Served with a permanent, stable, and publically accessible document
addrtype	RFC 8866	RFC Required
association-usage Name Registry	RFC 8841	First Come First Served
attribute-name (formerly "att-field")	RFC 8866 RFC 8864 RFC 8859	Specification Required (Expert: Flemming Andreasen)
bwtype	RFC 8866 RFC 8859	Standards Action
Candidate Attribute Extensions	RFC 8839	Specification Required (Expert: Christer Holmberg)
Codec Control Messages	RFC 5104 RFC 8859	Specification Required (Expert: Stephan Wenger)
content SDP Parameters	RFC 4796 RFC 8859	Specification Required (Expert: Christer Holmberg)
"cs-correlation" Attribute Values	RFC 7195 RFC 8859	Specification Required (Expert: Bo Burman)
"depend" SDP Attribute Values	RFC 5583 RFC 8859	Specification Required (Expert: Stephan Wenger)
enckey	RFC 8866	REGISTRY OBSOLETED - No further registrations accepted
Key Methods	RFC 4568	Standards Action
media	RFC 8866	Standards Action
Media Clock Source Parameters	RFC 7273 RFC 8859	Specification Required (Expert: Magnus Westerlund)
Media Stream Transports	RFC 4568	Standards Action
Multiplexing Categories	RFC 8859	Standards Action
nettype	RFC 8866	RFC Required
proto	RFC 8866	RFC Required
QoS Mechanism Tokens	RFC 5432 RFC 8859	Specification Required (Expert: Christer Holmberg)
RID Attribute Parameters	RFC 8851	Specification Required (Expert: Adam Roach)
"rtcp-fb" Attribute Values	RFC 4585 RFC 8859	First Come First Served with permanent, stable, and publically accessible document.
SDP Capability Negotiation Configuration Parameters Registry	RFC 5939 RFC 6871	IETF Review
SDP Capability Negotiation Option Tags	RFC 5939 RFC 8859	IETF Review
SDP/RTSP key management protocol identifiers	RFC 4567 RFC 8859	Specification Required (Expert: Magnus Westerlund)
Semantics for the "group" SDP Attribute	RFC 5888 RFC 8859	Standards Action
Semantics for the "ssrc-group" SDP Attribute	RFC 5576 RFC 8859	Standards Action
SRTP Crypto Suite Registrations	RFC 4568	Standards Action
SRTP Session Parameters	RFC 4568	Standards Action
Timestamp Reference Clock Source Parameters	RFC 7273 RFC 8859	Specification Required (Expert: Magnus Westerlund)
Session Initiation Protocol (SIP) Common Log Format (CLF) Parameters
SIP CLF Transport Flag Values	RFC 6873	IETF Review
SIP CLF Version Values	RFC 6873	Standards Action
Session Initiation Protocol (SIP) Event Types Namespace
Event packages and Event template-packages	RFC 3427 RFC 6665 RFC 5727	event template packages: Standards Action event packages: RFC Required with Designated Expert
Session Initiation Protocol (SIP) Parameters
Compression Schemes	RFC 3486	Standards Action
Geolocation-Error Codes	RFC 6442	Specification Required (Expert: Unassigned)
Global Feature-Capability Indicator Registration Tree	RFC 6809	Specification Required (Expert: Paul Kyzivat (primary), Christer Holmberg (secondary))
Header Field Parameters and Parameter Values	RFC 3968	IETF Review
Header Fields	RFC 3261 RFC 5727	Informational Header: Expert Review Standard Header: Standards Action
Identity Parameters	RFC 8224	Standards Action
Identity-Info Algorithm Parameter Values	RFC 8224	Deprecated and closed per RFC8224
Info Packages Registry	RFC 6086	Specification Required (Expert: Adam Roach)
Methods and Response Codes	RFC 3261 RFC 5727	Standards Action
Option Tags	RFC 3261 RFC 5727	Standards Action
Precondition Types Used with SIP	RFC 4032 RFC 3312	Standards Action
Preemption Namespaces	RFC 4411	Standards Action
Priority Header Field Values	RFC 6878	IETF Review
Proxy-Feature Feature-Capability Indicator Trees	RFC 6809	Standards Action
Push Notification Service (PNS)	RFC 8599	Specification Required (Expert: Christer Holmberg)
Reason Codes	RFC 6665	Standards Action
Reason Protocols	RFC 3326	Specification Required (Expert: Christer Holmberg)
Resource-Priority Namespaces	RFC 4412 RFC 7134	IETF Review
Resource-Priority Priority-values	RFC 4412 RFC 7134	IETF Review
Response Codes	RFC 3261	RFC Required
Security Mechanism Names	RFC 3329	IETF Review
Service-ID/Application-ID Labels	RFC 6050	Specification Required (Expert: Unassigned)
SIP AlertMsg-Error Codes	RFC 8876	Specification Required (Expert: Brian Rosen)
SIP Configuration Profile Types	RFC 6080	Specification Required (Expert: Unassigned)
SIP Feature-Capability Indicator Registration Tree	RFC 6809	IETF Review
SIP Forum User Agent Configuration Parameters	RFC 6011	begins with 'sfua-': RFC Required all other names: First Come First Served
SIP Privacy Header Field Values	RFC 3323	IETF Review
SIP Transport	RFC 7118	Standards Action
SIP/SIPS URI Parameters	RFC 3969 RFC 5727	Standards Action
URI Purposes	RFC 4575	Specification Required (Expert: Unassigned)
UUI Content Parameters	RFC 7433	Standards Action
UUI Encoding Parameters	RFC 7433	Standards Action
UUI Packages	RFC 7433	Standards Action
Warning Codes (warn-codes)	RFC 3261	RFC Required
Session Initiation Protocol (SIP) Privacy Header Values
SIP Privacy Header Values	RFC 3323	IETF Review
Session Peering Provisioning Framework (SPPF) Organization Identifier Type Namespaces
SPPF OrgIdType Namespaces	RFC 7877	RFC Required
Session Traversal Utilities for NAT (STUN) Parameters
STUN Attributes	RFC 8489	0x0000-0x3FFF: IETF Review 0x4000-0x7FFF: Expert Review 0x8000-0xBFFF: IETF Review 0xC000-0xFFFF: Expert Review
STUN Error Codes	RFC 8489	IETF Review
STUN Methods	RFC 8489 RFC 7983	0x000-0x07F: IETF Review 0x080-0x0FF: Expert Review
STUN Password Algorithms	RFC 8489	0x0000-0x7FFF: IETF Review 0x8000-0xFFFF: Expert Review
STUN Security Features	RFC 8489	Standards Action
Traversal Using Relays around NAT (TURN) Channel Numbers	RFC 7983 RFC 8656	Standards Action
SFrame
SFrame Cipher Suites	RFC 9605	0-0xEFFF: Specification Required 0-0xEFFF: Standards Action 0xF000-0xFFFF: Private Use
Shim6 Parameters
Shim6 Error Codes	RFC 5533	Standards Action
Shim6 Options	RFC 5533	Standards Action
Shim6 Types	RFC 5533	Standards Action
Shim6 Verification Methods	RFC 5533	Standards Action
Sieve Extensions
ManageSieve Capabilities	RFC 5804	Standards Track or IESG-Approved Experimental RFC
ManageSieve Response Codes	RFC 5804	Standards Track or IESG-Approved Experimental RFC
Notification-Capability Parameters	RFC 5435	Vendor-controlled: First Come First Served IETF-controlled: Specification Required
Sieve Actions	RFC 9122	Expert Review (Expert: Alexey Melnikov, Ken Murchison)
Sieve Environment Items	RFC 5183	name begins with "vnd.": First Come First Served standardized (no "vnd." prefix): Standards track or experimental RFC
Sieve Extensions	RFC 5228	vendor-controlled (name begins with "vnd."): First Come First Served IETF-controlled (no "vnd." prefix): Standards track or IESG-approved experimental RFC
Sieve Notification Mechanisms	RFC 5435	Vendor-controlled: First Come First Served IETF-controlled: Specification Required
Sieve URN Parameters	RFC 6134	Specification Required (Expert: Unassigned)
SIG (0) Algorithm Numbers
SIG (0) Algorithm Numbers	RFC 3755	Standards Action
Signaling Compression (SigComp) Registry
SigComp_version Namespace	RFC 3320	Standards Action
Signaling User Adaptation Layer Assignments
Message Classes	RFC 3057 RFC 4233	IETF Review
Message Parameters	RFC 3331 RFC 4233 RFC 4666	IETF Review
Message Types - ASP State Maintenance (ASPSM) Messages (Value 3)	RFC 4233 RFC 3331 RFC 4666 RFC 3868 RFC 4129 RFC 3057	IETF Review
Message Types - ASP Traffic Maintenance (ASPTM) Messages (Value 4)	RFC 4233 RFC 3331 RFC 4666 RFC 3868 RFC 4129 RFC 3057	IETF Review
Message Types - Connection-Oriented Messages (Value 8)	RFC 3868	IETF Review
Message Types - Connectionless Messages (Value 7)	RFC 3868	IETF Review
Message Types - DPNSS/DASS2 Boundary Primitives Transport Messages (Value 13)	RFC 4129	IETF Review
Message Types - Interface Identifier Management (IIM) Messages (Value 10)	RFC 3331	IETF Review
Message Types - M2PA Messages (Value 11)	RFC 4165	IETF Review
Message Types - Management (MGMT) Message (Value 0)	RFC 4233 RFC 3331 RFC 4666 RFC 3868 RFC 4129 RFC 3057	IETF Review
Message Types - MTP2 User Adaptation (MAUP) Messages (Value 6)	RFC 3331	IETF Review
Message Types - Q.921/Q.931 Boundary Primitives Transport (QPTM) Messages (Value 5)	RFC 4233	IETF Review
Message Types - Routing Key Management (RKM) Messages (Value 9)	RFC 4666	IETF Review
Message Types - Security Messages (Value 12)	RFC 3788	IETF Review
Message Types - SS7 Signalling Network Management (SSNM) Messages (Value 2)	RFC 4666 RFC 3868	IETF Review
Message Types - Transfer Messages (Value 1)	RFC 4666	IETF Review
Message Types - V5 Boundary Primitives Transport (V5PTM) Messages (Value 14)	RFC 3807	IETF Review
Simple Authentication and Security Layer (SASL) Mechanisms
SASL Mechanisms	RFC 4422	First Come First Served for mechanisms. Expert Review with mailing list for family name registrations. For names beginning with "GS2-", see RFC 5801. For names beginning with "SCRAM-", see RFC7677. (Expert: Simon Josefsson)
SASL SCRAM Family Mechanisms	RFC 7677	IETF Review with mailing list
Simple Certificate Enrollment Protocol (SCEP)
SCEP CA Capabilities	RFC 8894	IETF Review
SCEP Message Types	RFC 8894	Specification Required (Expert: Peter Gutmann)
Simple Gateway Monitoring Protocol (SGMP) Vendor Specific Codes (Obsolete)
SGMP Vendor Specific Codes (Obsolete)	RFC 1028	No further registrations
Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes Registry
Class Sub-Codes	RFC 5248	Specification Required (Expert: Chris Newman)
Enumerated Status Codes	RFC 5248	Specification Required (Expert: Chris Newman)
Subject Sub-Codes	RFC 5248	Specification Required (Expert: Chris Newman)
Simple Network Management Protocol (SNMP) Number Spaces
Message Processing Models	RFC 3411	Standards Action
Security Models	RFC 3411	Standards Action
SNMP Transport Domains	RFC 2578 RFC 3417 RFC 5590	Specification Required (Expert: Unassigned)
SnmpAuthProtocols	RFC 3411	Standards Action
SnmpEngineID Formats	RFC 3411 RFC 5343	1-127: Specification Required 128-255: Enterprise-specific
SnmpPrivProtocols	RFC 3411	Standards Action
Simple Two-way Active Measurement Protocol (STAMP)
Return Path Control Code Flags	RFC 9503	31-12: IETF Review 11-8: First Come First Served 7-4: Experimental Use 3-0: Private Use
Return Path Sub-TLV Types	RFC 9503	1-175: IETF Review 176-239: First Come First Served 240-251: Experimental Use 252-254: Private Use
STAMP Return Codes	RFC 8972	1-127: IETF Review 128-239: First Come First Served 240-249: Experimental Use 250-254: Private Use
STAMP Sub-TLV Types	RFC 8972	1-175: IETF Review 176-239: First Come First Served 240-251: Experimental Use 252-254: Private Use
STAMP Synchronization Sources	RFC 8972	1-127: IETF Review 128-239: First Come First Served 240-249: Experimental Use 250-254: Private Use
STAMP Timestamping Methods	RFC 8972	1-127: IETF Review 128-239: First Come First Served 240-249: Experimental Use 250-254: Private Use
STAMP TLV Flags	RFC 8972	IETF Review
STAMP TLV Types	RFC 8972	1-175: IETF Review 176-239: First Come First Served 240-251: Experimental Use 252-254: Private Use
SMTP MTA Strict Transport Security (MTA-STS)
MTA-STS Policy Fields	RFC 8461	Expert Review (Expert: Unassigned)
MTA-STS TXT Record Fields	RFC 8461	Expert Review (Expert: Unassigned)
Snoop Datalink Types
Datalink Types	RFC 3827	0-26: Reserved 27-4294967295: First Come First Served
SOCKS Methods
SOCKS Method Values	RFC 1928	IESG Approval
Software ID Values
Software ID Entity Role Values	RFC 9393	0-127: Standards Action with Expert Review 128-255: Specification Required
Software ID Link Ownership Values	RFC 9393	0-127: Standards Action with Expert Review 128-255: Specification Required
Software ID Link Relationship Values	RFC 9393	0-32767: Standards Action with Expert Review 32768-65535: Specification Required
Software ID Link Use Values	RFC 9393	0-127: Standards Action with Expert Review 128-255: Specification Required
Software ID Version Scheme Values	RFC 9393	0-16383: Standards Action with Expert Review 16384-65535: Specification Required
Software Update for the Internet of Things (SUIT)
COSE SUIT Algorithm Profiles	draft-ietf-suit-mti-23	Standards Action
SUIT Commands	draft-ietf-suit-manifest-34	less than -255: Private Use -255 to 255: Standards Action greater than 255: Specification Required
SUIT Common Elements	draft-ietf-suit-manifest-34	less than -255: Private Use -255 to 255: Standards Action greater than 255: Specification Required
SUIT Component Text Values	draft-ietf-suit-manifest-34	less than -255: Private Use -255 to 255: Standards Action greater than 255: Specification Required
SUIT Envelope Elements	draft-ietf-suit-manifest-34	less than -255: Private Use -255 to 255: Standards Action greater than 255: Specification Required
SUIT Manifest Elements	draft-ietf-suit-manifest-34	less than -255: Private Use -255 to 255: Standards Action greater than 255: Specification Required
SUIT Parameters	draft-ietf-suit-manifest-34	less than -255: Private Use -255 to 255: Standards Action greater than 255: Specification Required
SUIT Text Values	draft-ietf-suit-manifest-34	less than -255: Private Use -255 to 255: Standards Action greater than 255: Specification Required
SUIT_Capability_Report Elements	draft-ietf-suit-report-19	-4294967296 to -65537: First Come First Served -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required 65536 to 4294967295: First Come First Served
SUIT_Record Elements	draft-ietf-suit-report-19	-4294967296 to -65537: First Come First Served -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required 65536 to 4294967295: First Come First Served
SUIT_Report Elements	draft-ietf-suit-report-19	-4294967296 to -65537: First Come First Served -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required 65536 to 4294967295: First Come First Served
SUIT_Report Reasons	draft-ietf-suit-report-19	-4294967296 to -65537: First Come First Served -65536 to -257: Specification Required -256 to 255: Standards Action With Expert Review 256 to 65535: Specification Required 65536 to 4294967295: First Come First Served
Special People Numbers Registry (SPNR)
Special People Numbers Registry		Not an IETF Registry. Contact IANA
Special-Purpose Autonomous System (AS) Numbers
Special-Purpose AS Numbers	RFC 7249	IETF Review
Special-Use Domain Names
Special-Use Domain Names	RFC 6761	Standards Action or IESG Approval
STARTTLS Validation Result Types
STARTTLS Validation Result Types	RFC 8460	Expert Review (Expert: Alexander Brotman, Daniel Margolis, Viktor Dukhovni)
Straightforward-NAPTR (S-NAPTR) Parameters
S-NAPTR Application Protocol Tags	RFC 3958 RFC 4848	Specification Required in form of an RFC (Expert: Jouni Korhonen)
S-NAPTR Application Service Tags	RFC 3958 RFC 4848	Specification Required in form of an RFC (Expert: Jouni Korhonen)
Stream Control Transmission Protocol (SCTP) Parameters
Adaptation Code Points	RFC 5061	IETF Review
Chunk Flags	RFC 9260	RFC Required
Chunk Parameter Types	RFC 9260	IETF Review
Chunk Types	RFC 9260	IETF Review
Error Cause Codes	RFC 9260	Specification Required (Expert: Michael Tuexen, Randall Stewart)
Error Detection Methods	RFC 9653	Specification Required (Expert: Michael Tuexen, Magnus Westerlund)
Hashed Message Authentication Code (HMAC) Identifiers	RFC 4895	Specification Required (Expert: Unassigned)
SCTP Payload Protocol Identifiers	RFC 9260	First Come First Served
Stringprep Profiles
Stringprep Profiles	RFC 3454	IETF Review
Structure of Management Information (SMI) Numbers (MIB Module Registrations)
Interface Types (ifType)	RFC 1213 RFC 2863 RFC 7224 RFC 8892	Expert Review (Expert: Dave Thaler)
Internet-standard MIB - Mail Monitoring
Internet-standard MIB - Network Services Monitoring
IPFIX-SELECTOR-MIB Functions	RFC 6615	Expert Review (Expert: Unassigned)
MIB - Remote Network Monitoring	RFC 2819 RFC 3737	Standards Action
Private Enterprise Numbers (PENs)	RFC 9371	First Come First Served
SMI Experimental Codes	RFC 4181 RFC 2578 RFC 1155	Experimental RFC
SMI Features	RFC 2506	Not Defined ?
SMI mail Codes		Not Defined ?
SMI mib-2 snanauMIB Codes	RFC 1666	Not Defined ?
SMI Network Management Directory Codes
SMI Network Management MGMT Codes	RFC 2578	Not Defined ?
SMI pib PIB Codes	RFC 3159	Standards Action
SMI Private Codes	RFC 2578	Not Defined
SMI Security Codes (including S/MIME, PKIX and LTANS)		Not Defined ?
SMI Security for Cryptographic Algorithms	RFC 8411	Specification Required (Expert: Russ Housley (primary), Sean Turner (secondary))
SMI Security for Name System Designators Codes (nametypes)		Not Defined ?
SMI Security Services Codes		IETF Review
SMI SNMPv2 Codes	RFC 2578 RFC 1902	IETF Review
SNMP Management Architecture - Message Processing Subsystem (SnmpMessageProcessingModel)
SNMP Management Architecture - Security Subsystem (SnmpSecurityModel)
SNMP-TLSTM HashAlgorithms	RFC 9456	Expert Review (Expert: Russ Housley, Sean Turner)
spdActions	RFC 4807	Specification Required (Expert: Wes Hardaker)
Transmission Number Values	RFC 1213 RFC 8892	Specification Required (Expert: Dave Thaler)
Tunnel Types (tunnelType)	RFC 4087 RFC 8675 RFC 8892	Expert Review (Expert: Dave Thaler)
Structured Data Exchange Format (SDXF)
Compression Methods for SDXF	RFC 3072	RFC or equivalent
Encryption Methods for SDXF	RFC 3072	RFC or equivalent
Subsequent Address Family Identifiers (SAFI) Parameters
SAFI Values	RFC 4760	1-63: Standards Action 64-127: First Come First Served 128-240: Some recognized assignments below, others Reserved 241-254: Reserved for Private Use
SUN Remote Procedure Call (RPC) Numbers - Obsolete
SUN RPC Numbers	RFC 1831
syslog Parameters
syslog Message Facilities	RFC 5424	IETF Review
syslog Message Severities	RFC 5424	IETF Review
syslog Structured Data ID Values	RFC 5424	IETF Review
syslog Version Values	RFC 5424	Standards Action
syslog-sign Hash Algorithm Values	RFC 5848	IETF Review
syslog-sign Key Blob Type Values	RFC 5848	IETF Review
syslog-sign Protocol Version Values	RFC 5848	IETF Review
syslog-sign SG Field Values	RFC 5848	IETF Review
syslog-sign Signature Scheme Values	RFC 5848	IETF Review
System for Cross-domain Identity Management (SCIM) Schema URIs
SCIM Event URIs	draft-ietf-scim-events-15	Expert Review (Expert: Unassigned)
SCIM Schema URIs for Data Resources	RFC 7643	"core" and "API" schemas: RFC and Expert Review Required All other schemas: Expert Review
SCIM Server-Related Schema URIs	RFC 7643	"core" and "API" schemas: RFC and Expert Review Required All other schemas: Expert Review
TCP Convert Protocol (Convert) Parameters
Convert Errors	RFC 8803	1-127: IETF Review 128-191: Specification Required 192-255: Private Use
Convert TLVs	RFC 8803	1-127: IETF Review 128-191: Specification Required 192-255: Private Use
Convert Versions	RFC 8803	IETF Review
Telephony Routing over IP (TRIP) Parameters
TRIP Address Families	RFC 3219	Expert Review (Expert: Jonathan Rosenberg)
TRIP Application Protocols	RFC 3219	Expert Review (Expert: Jonathan Rosenberg)
TRIP Attributes	RFC 3219	Specification Required (Expert: Unassigned)
TRIP Capabilities	RFC 3219	Specification Required (Expert: Unassigned)
TRIP IP Telephony Administrative Domain (ITAD) Numbers	RFC 3219 RFC 8602	First Come First Served
Telnet Options
CAST5_40_CFB64 (Type 8) and CAST128_CFB64 (Type 10) Telnet Encryption Types	RFC 2950	First Come First Served
CAST5_40_OFB64 (Type 9) and CAST128_OFB64 (Type 11) Telnet Encryption Types	RFC 2949	First Come First Served
DES3_CFB64 Telnet Encryption Type (Type 3)	RFC 2947	First Come First Served
DES3_OFB64 Telnet Encryption Type (Type 4)	RFC 2948	First Come First Served
DES_CFB64 Telnet Encryption Type (Type 1)	RFC 2952	First Come First Served
DES_OFB64 Telnet Encryption Type (Type 2)	RFC 2953	First Come First Served
DSS Authentication Type (Type 14)	RFC 2943	Specification Required (Expert: Unassigned)
KEA_SJ (Type 12) and KEA_SJ_INTEG (Type 13) Authentication Types	RFC 2951	Specification Required (Expert: Unassigned)
KERBEROS_V4 Telnet Authentication Type (Type 1)	RFC 1411	First Come First Served
KERBEROS_V5 Telnet Authentication Type (Type 2)	RFC 2942	Specification Required (Expert: Unassigned)
SRP Telnet Authentication Type (Type 5)	RFC 2944	Specification Required (Expert: Unassigned)
Telnet Authentication Types (Option 37)	RFC 2941	First Come First Served
Telnet Encryption Types (Option 38)	RFC 2946	First Come First Served
Telnet Options	RFC 855	IETF Review
Terminal Type Names
Terminal Type Names	RFC 1091	Not defined?
The Binary Floor Control Protocol (BFCP) Parameters
Attributes	RFC 8855	Specification Required (Expert: Brian Rosen, Tom Kristensen)
Error Codes	RFC 8855	Specification Required (Expert: Brian Rosen, Tom Kristensen)
Primitives	RFC 8855	Specification Required (Expert: Brian Rosen, Tom Kristensen)
Request Statuses	RFC 8855	Specification Required (Expert: Brian Rosen, Tom Kristensen)
The Extensible Authentication Protocol Mechanism for the Generic Security Service Application Programming Interface (GSS-EAP) Parameters
GSS-EAP Context Flags	RFC 7055	IETF Review or IESG Approval
GSS-EAP Error Codes	RFC 7055	0-127: Standards Action 128-255: Specification Required
GSS-EAP Subtoken Types	RFC 7055	Expert Review (Expert: Joseph Salowey)
Time Zone Data Distribution Service (TZDIST) Parameters
TZDIST Identifiers	RFC 7808	IETF Review
TZDIST Service Actions	RFC 7808	Specification Required (Expert: Michael Douglass)
Timed Efficient Stream Loss-tolerant Authentication (TESLA) Parameters
Cryptographic Message Authentication Code (MAC) Function, TESLA-MAC Values	RFC 4442	Expert Review (Expert: MSEC working group or its designated successor)
Cryptographic Pseudo-Random Function, TESLA-PRF Values	RFC 4442	Expert Review (Expert: MSEC working group or its designated successor)
Signature Cryptographic Function, TESLA-SIG-CRYPTO-FUNC Values	RFC 5776	Expert Review (Expert: MSEC working group or its designated successor)
Signature Encoding Algorithm, TESLA-SIG-ALGO Values	RFC 5776	Expert Review (Expert: MSEC working group or its designated successor)
TLS-based Posture Transport Protocol (PT-TLS)
PT-TLS Error Codes	RFC 6876	Specification Required (Expert: Unassigned)
PT-TLS Message Types	RFC 6876	Specification Required (Expert: Unassigned)
Token Binding Protocol
Token Binding Extensions	RFC 8471	Specification Required (Expert: Andrei Popov, Dirk Balfanz)
Token Binding Key Parameters	RFC 8471	Specification Required (Expert: Andrei Popov, Dirk Balfanz)
Token Binding Types	RFC 8471	Specification Required (Expert: Andrei Popov, Dirk Balfanz)
Trailer Types
Trailer Types	RFC 6081	Specification Required (Expert: Unassigned)
Transfer Encodings
Transfer Encodings	RFC 4289	Standards Action
Transmission Control Protocol (TCP) Header Flags
TCP Header Flags	RFC 9293	Standards Action
Transmission Control Protocol (TCP) Parameters
Cryptographic Algorithms for TCP-AO Registration	RFC 5926	RFC Publication After Expert Review
MPTCP Handshake Algorithms	RFC 8684	Standards Action
MPTCP MP_TCPRST Reason Codes	RFC 8684	Specification Required (Expert: Unassigned)
MPTCP Option Subtypes	RFC 8684	Standards Action
TCP Alternate Checksum Numbers	RFC 1146	Not defined
TCP Encryption Protocol Identifiers	RFC 8547	IETF Review or Expert Review with RFC Required (Expert: Unassigned)
TCP Header Flags	RFC 9293	Standards Action
TCP Option Kind Numbers	RFC 2780	Standards Action or IESG Approval
TCP/UDP Experimental Option Experiment Identifiers (TCP/UDP ExIDs)	RFC 6994 RFC 9868	First Come First Served
tcpcrypt AEAD Algorithms	RFC 8548	IETF Review or Expert Review with RFC Required (Expert: Unassigned)
Transparent Interconnection of Lots of Links (TRILL) Parameters
Extended RBridge Channel Payload Types	RFC 7978	IETF Review
Extended RBridge Channel Security Types	RFC 7978	IETF Review
Interested Labels Flag Bits	RFC 7176 RFC 7357	IETF Review
Interested VLANs Flag Bits	RFC 7176 RFC 7357	IETF Review
PORT-TRILL-VER Sub-TLV Capability Flags	RFC 7176	IETF Review
RBridge Channel Error Codes	RFC 7178	Standards Action
RBridge Channel Header Flags	RFC 7178	IETF Review
RBridge Channel Protocols	RFC 7178	0x002-0x0FF: Standards Action 0x100-0xFF7: RFC Required 0x100-0xFF7: IESG Approval
TRILL APPsub-TLV Types under IS-IS TLV 251 Application Identifier 1	RFC 7357	IETF Review with additional requirements on the documentation of the use being registered as specified in Section 7.2 of RFC 7357.
TRILL Ethertypes	RFC 8377	Ethertypes are assigned by the IEEE Registration Authority. Updates to this registry are coordinated with the designated expert. (Expert: Donald Eastlake (primary), Sue Hares (secondary))
TRILL Extended Header Flags	RFC 7179	IETF Review
TRILL Multicast Addresses	RFC 6325	IETF Review
TRILL Neighbor TLV NEIGHBOR RECORD Flags	RFC 7176	Standards Action
TRILL Nicknames	RFC 6325	RFC Required (single value) or IETF Review (single or multiple values)
TRILL OAM Return Codes	RFC 7455	Standards Action
TRILL Pull Directory Errors	RFC 8171	IETF Review
TRILL Pull Directory Query Types (QTYPEs)	RFC 8171	IETF Review
TRILL-VER Sub-TLV Capability Flags	RFC 7176	IETF Review
Transport Layer Security (TLS)
TLS Alerts	draft-ietf-tls-rfc8446bis-13 draft-ietf-tls-tls12-frozen-08	Standards Action
TLS Application-Layer Protocol Negotiation (ALPN) Protocol IDs	RFC 7301 RFC 8447 RFC 9847	Expert Review (Expert: Yoav Nir, Rich Salz, Nick Sullivan)
TLS Authorization Data Formats	RFC 5878 RFC 8447 draft-ietf-tls-tls12-frozen-08 RFC 9847	0-63: IETF Review 64-223: Specification Required 224-255: Reserved for Private Use
TLS CachedInformationType Values	RFC 7924 draft-ietf-tls-tls12-frozen-08 RFC 9847	0-63: Standards Action 64-223: Specification Required
TLS Certificate Compression Algorithm IDs	RFC 8879 draft-ietf-tls-tls12-frozen-08 RFC 9847	1-255: IETF Review 256-16383: Specification Required 16384-65535: Experimental Use
TLS Certificate Status Types	RFC 6961 draft-ietf-tls-rfc8446bis-13 draft-ietf-tls-tls12-frozen-08 RFC 9847	IETF Review
TLS Certificate Types	RFC 6091 draft-ietf-tls-rfc8446bis-13 RFC 8447 draft-ietf-tls-tls12-frozen-08 RFC 9847	"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value: Specification Required
TLS Cipher Suites	draft-ietf-tls-rfc8446bis-13 RFC 8447 RFC 9147 draft-ietf-tls-tls12-frozen-08 RFC 9847	"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value: Specification Required
TLS ClientCertificateType Identifiers	RFC 5246 RFC 8447 draft-ietf-tls-tls12-frozen-08 RFC 9847	0-223 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval 0-223 ("Recommended" set to "N," not transitioning from another value): Specification Required 224-255: Reserved for Private Use
TLS Compression Method Identifiers	RFC 3749 RFC 8447	0-63: Standards Action 64-223: Specification Required 224-255: Reserved for Private Use
TLS ContentType	draft-ietf-tls-rfc8446bis-13 RFC 9443 draft-ietf-tls-tls12-frozen-08 RFC 9847	Standards Action
TLS EC Curve Types	RFC 8422 draft-ietf-tls-tls12-frozen-08 RFC 9847	Specification Required (Expert: Yoav Nir, Rich Salz, Nick Sullivan)
TLS EC Point Formats	RFC 8422 draft-ietf-tls-tls12-frozen-08 RFC 9847	Specification Required (Expert: Yoav Nir, Rich Salz, Nick Sullivan)
TLS ECHConfig Extension	RFC 9849	Specification Required (Expert: Rich Salz, Nick Sullivan)
TLS Exporter Labels	RFC 5705 RFC 8447 RFC 9847	"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value: Expert Review
TLS ExtensionType Values	draft-ietf-tls-rfc8446bis-13 RFC 8447 RFC 9146 draft-ietf-tls-tls12-frozen-08 RFC 9847	"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value: Specification Required
TLS HandshakeType	draft-ietf-tls-rfc8446bis-13 draft-ietf-tls-tls12-frozen-08	Standards Action
TLS HashAlgorithm	RFC 5246 RFC 8447 RFC 9155 draft-ietf-tls-tls12-frozen-08 RFC 9847	0-223 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval 0-223 ("Recommended" set to "N," not transitioning from another value): Specification Required 224-255: Reserved for Private Use
TLS Heartbeat Message Types	RFC 6520 RFC 8447 draft-ietf-tls-tls12-frozen-08 RFC 9847	Expert Review (Expert: Yoav Nir, Rich Salz, Nick Sullivan)
TLS Heartbeat Modes	RFC 6520 RFC 8447 draft-ietf-tls-tls12-frozen-08 RFC 9847	Expert Review (Expert: Yoav Nir, Rich Salz, Nick Sullivan)
TLS KDF Identifiers	RFC 9258 draft-ietf-tls-tls12-frozen-08 RFC 9847	0x0000-0xfeff: Specification Required 0xff00-0xffff: Private Use
TLS PskKeyExchangeMode	draft-ietf-tls-rfc8446bis-13 draft-ietf-tls-tls12-frozen-08 RFC 9847	"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value: Specification Required
TLS RRC Message Types	RFC 9853	Expert Review (Expert: Rich Salz, Nick Sullivan, Yoav Nir)
TLS SignatureAlgorithm	RFC 5246 RFC 8447 RFC 9155 draft-ietf-tls-tls12-frozen-08 RFC 9847	0-223 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval 0-223 ("Recommended" set to "N," not transitioning from another value): Specification Required 224-255: Reserved for Private Use
TLS SignatureScheme	draft-ietf-tls-rfc8446bis-13 draft-ietf-tls-tls12-frozen-08 RFC 9847	"Recommended" set to/transitioning from "Y" or "D": Either Standards Action With Expert Review or IESG Approval "Recommended" set to "N," not transitioning from another value: Specification Required
TLS SSLKEYLOGFILE Labels	draft-ietf-tls-keylogfile-05 RFC 9847	Specification Required (Expert: Unassigned)
TLS Supplemental Data Formats (SupplementalDataType)	RFC 4680 RFC 8447 draft-ietf-tls-tls12-frozen-08 RFC 9847	0-16385: Standards Action 16386-65279: IETF Review 65280-65535: Reserved for Private Use
TLS Supported Groups	RFC 8422 RFC 7919 draft-ietf-tls-rfc8446bis-13 RFC 8447 draft-ietf-tls-tls12-frozen-08 RFC 9847 draft-ietf-tls-hybrid-design-16	0-255 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval 0-255 ("Recommended" set to "N," not transitioning from another value): Specification Required 256-511 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval 256-511 ("Recommended" set to "N," not transitioning from another value): Specification Required 512-65535 ("Recommended" set to/transitioning from "Y" or "D"): Either Standards Action with Expert Review or IESG Approval 512-65535 ("Recommended" set to "N," not transitioning from another value): Specification Required
TLS UserMappingType Values	RFC 4681 draft-ietf-tls-tls12-frozen-08 RFC 9847	0-63: Standards Action 64-223: Specification Required 224-255: Reserved for Private Use
Trusted Execution Environment Provisioning (TEEP)
TEEP CBOR Labels	draft-ietf-teep-protocol-26	0-255: Standards Action 256-1023: Specification Required
TEEP data-item-requested Bits	draft-ietf-teep-protocol-26	0-23: Standards Action 24-254: Specification Required 255: Private Use
TEEP Error Codes	draft-ietf-teep-protocol-26	0-23: Standards Action 24-255: Specification Required
TEEP Freshness Mechanisms	draft-ietf-teep-protocol-26	0-23: Standards Action 24-255: Specification Required
TEEP Message Types	draft-ietf-teep-protocol-26	0-23: Standards Action 24-255: Specification Required
Tunnel Setup Protocol (TSP) Parameters
Tunnel Types	RFC 5572	First Come First Served
Two-way Active Measurement Protocol (TWAMP) Parameters
TWAMP-Control Command Numbers	RFC 5357 RFC 5938	IETF Review
TWAMP-Modes	RFC 5618 RFC 5938 RFC 7717	IETF Review
UDP Speed Test Protocol (UDPSTP)
PDU Identifier	RFC 9946	0x0000: Reserved 0x0001-0x7F00: Specification Required 0x7F01-0x7FE0: Experimental Use 0x7FE1-0x7FFF: Private Use 0x8000-0xFFFE: IETF Review 0xFFFF: Reserved
Protocol Version	RFC 9946	0-19: Reserved 20-40960: IETF Review 40961-53248: Specification Required 53249-65534: Experimental Use 65535: Reserved
Test Activation PDU Command Request	RFC 9946	0-127: IETF Review 128-239: Specification Required 240-249: Experimental Use 250-254: Private Use 255: Reserved
Test Activation PDU Command Response Field	RFC 9946	0-127: IETF Review 128-239: Specification Required 240-249: Experimental Use 250-254: Private Use 255: Reserved
Test Activation PDU Modifier Bitmap	RFC 9946	00000000-01111111: IETF Review 10000000: Reserved
Test Activation PDU Rate Adjustment Algo	RFC 9946	A-Y: IETF Review Z: Reserved
Test Setup PDU Authentication Mode	RFC 9946	0-59: IETF Review 60-63: Experimental Use 64-255: Reserved
Test Setup PDU Command Response Field	RFC 9946	0-127: IETF Review 128-239: Specification Required 240-249: Experimental Use 250-254: Private Use 255: Reserved
Test Setup PDU Modifier Bitmap	RFC 9946	00000000-01111111: IETF Review 10000000: Reserved
Unidirectional Lightweight Encapsulation (ULE) Next-Header Registry
Mandatory Extension Headers (or link-dependent type fields) for ULE (Range 0-255 decimal)	RFC 4326 RFC 7280	Specification Required (Expert: Gorry Fairhurst)
Optional Extension Headers for ULE (Range 256-511 decimal)	RFC 4326 RFC 7280	Specification Required (Expert: Gorry Fairhurst)
Uniform Resource Identifier (URI) Schemes
"about" URI Tokens	RFC 6694	First Come First Served
'geo' URI 'crs' Parameter Values	RFC 5870	IESG Approval with Specification Required
'geo' URI Parameters	RFC 5870	Specification Required (Expert: Unassigned)
'ipn' Scheme URI Allocator Identifiers	RFC 9758	0-0xFFFF: Expert Review 0x10000-0x3FFFFFFF: Expert Review 0x40000000-0x7FFFFFFF: Experimental Use 0x80000000-0xFFFFFFFF: Reserved >=0x100000000: Reserved
'ipn' Scheme URI Default Allocator Node Numbers	RFC 7116 RFC 9758	1-0x3FFF (1-16383): Private Use 0x4000-0xFFFFFFFE (16384-4294967294): Expert Review >=0x100000000 (>=4294967296): Invalid
'ipn' Scheme URI Well-Known Service Numbers for BPv7	RFC 9758	1-127: Private Use 128-255: Standards Action 0x0100-0x7FFF: Private Use 0x8000-0xFFFF: Specification Required 0x10000-0xFFFFFFFF: Private Use >=0x100000000: Reserved for future expansion
POSH Service Names	RFC 7711	Expert Review or IETF Review (Expert: Unassigned)
tel URI Parameters	RFC 5341	Specification Required (Expert: Vijay Gurbani)
Uniform Resource Identifier (URI) Schemes	RFC 7595 RFC 8615 draft-ietf-core-href-29	Permanent: Expert Review Provisional: First Come First Served Historical: Expert Review CRI Scheme Number field: 0-999: Expert Review CRI Scheme Number field: 1000-20000: First Come First Served
Well-Known URIs	RFC 8615	Specification Required (Expert: Mark Nottingham)
Uniform Resource Name (URN) Namespace for IETF Use
IETF URN Sub-namespace for Registered Protocol Parameter Identifiers	RFC 3553	IETF Review
IETF URN Sub-namespaces	RFC 6924	IETF Review
Uniform Resource Names (URN)
Alert URN Identifiers	RFC 7462	Specification Required (Expert: Dale Worley)
Alert URN Providers	RFC 7462	First Come First Served
Formal URN Namespaces	RFC 8141	Expert Review, per Section 6 of RFC 8141. Fast-track procedure for standards organizations described in Section 6.3. (Expert: Peter Saint-Andre (team leader), Dale Worley, Juha Hakala, Stephanie Nitsche, Lars Svensson)
Informal URN Namespaces	RFC 8141	Expert Review, per Section 6 of RFC 8141. (Expert: Peter Saint-Andre (team leader), Dale Worley, Juha Hakala, Stephanie Nitsche)
URN Service Labels	RFC 5031	Standards Action
User Datagram Protocol (UDP)
TCP/UDP Experimental Option Experiment Identifiers (TCP/UDP ExIDs)	RFC 6994 RFC 9868
UDP Option Kind Numbers	RFC 9868	Standards Action or IESG Approval
UUID
UUID Namespace IDs	RFC 9562	Specification Required (Expert: Kyzer Davis, Brad Peabody)
UUID Subtypes	RFC 9562	Standards Action With Expert Review (Expert: Kyzer Davis, Brad Peabody)
vCard Elements
vCard Parameter Values	RFC 6350	Expert Review and RFC Required (Expert: Primary: Simon Perreault; Backup: Peter Saint-Andre)
vCard Parameters	RFC 6350	No namespace specified: Expert Review and RFC Required Vendor namespace specified: First Come First Served
vCard Properties	RFC 6350	No namespace specified: Expert Review and RFC Required Vendor namespace specified: First Come First Served
vCard Property Values	RFC 6350	Expert Review and RFC Required (Expert: Primary: Simon Perreault; Backup: Peter Saint-Andre)
vCard Value Data Types	RFC 6350	Expert Review and RFC Required (Expert: Primary: Simon Perreault; Backup: Peter Saint-Andre)
VCDIFF Secondary Compressor ID Values
VCDIFF Secondary Compressor ID Values	RFC 3284	RFC or peer-reviewed permanent and readily available reference. Subject to the above, name assignments are First Come First Served.
Vectors of Trust (VoT)
Vectors of Trust Components	RFC 8485	Specification Required (Expert: Justin Richer, Leif Johansson)
'version' symbols used within the ISUP and QSIG
application/ISUP symbols	RFC 3204	Expert Review (Expert: Jon Peterson)
application/QSIG symbols	RFC 3204	Expert Review (Expert: Jon Peterson)
Virtual Network Computing (VNC) Uniform Resource Identifier (URI)
VNC URI Connection Channel Types	RFC 7869	First Come First Served
VNC URI ID Hash Algorithms	RFC 7869	First Come First Served
VNC URI Parameters	RFC 7869	First Come First Served
WAVE and AVI Codec Registries (Historic Registry)
WAVE and AVI Codec Registries	RFC 2361	IANA does not assign. Republication of values.
Web Authentication (WebAuthn)
WebAuthn Attestation Statement Format Identifiers	RFC 8809	Specification Required (Expert: Mike Jones, Giridhar Mandyam)
WebAuthn Extension Identifiers	RFC 8809	Specification Required (Expert: Mike Jones, Giridhar Mandyam)
Web Push Parameters
VAPID Authentication Scheme Parameters	RFC 8292	Specification Required (Expert: Martin Thomson)
Web Push Identifiers	RFC 8030	IETF Review
Webfinger Parameters
Webfinger Properties	RFC 7033	Expert Review (Expert: Unassigned)
WebRTC-HTTP Ingestion Protocol (WHIP)
WebRTC-HTTP Ingestion Protocol (WHIP) Extension URNs	RFC 9725	Specification Required (Expert: Sergio Garcia Murillo, Nils Ohlmeier)
WebRTC-HTTP Ingestion Protocol (WHIP) URNs	RFC 9725	Specification Required (Expert: Sergio Garcia Murillo, Nils Ohlmeier)
WebSocket Protocol Registries
WebSocket Close Code Number Registry	RFC 6455	1000-2999: Standards Action, Specification Required or IESG Review 3000-3999: First Come First Served
WebSocket Extension Name Registry	RFC 6455	First Come First Served
WebSocket Framing Header Bits Registry	RFC 6455	Standards Action
WebSocket Opcode Registry	RFC 6455	Standards Action
WebSocket Subprotocol Name Registry	RFC 6455 RFC 7936 RFC 8864	First Come First Served
WebSocket Version Number Registry	RFC 6455	Standard Version Numbers: IETF Review Interim Version Numbers: Expert Review
Wrapped Encapsulating Security Payload (WESP) Flags
WESP Flags	RFC 5840	IETF Review
WESP Version Numbers	RFC 5840	Standards Action
X.25 Type Numbers
X.25 Type Numbers		Not assigned by IANA
Xerox Network System (XNS) Protocol Types
Assigned internet packet types		Not assigned by IANA
Assigned well-known socket numbers		Not assigned by IANA
XML Evidence Record Syntax (XMLERS)
Cryptographic Information Type	RFC 6283	RFC Required
Time-Stamp Token Type	RFC 6283	RFC Required
XML Security URIs
XML Security URIs	RFC 9231	Specification Required (Expert: Donald Eastlake, Alexey Melnikov)
YANG Geographic Location Parameters
Geodetic System Values	RFC 9179	First Come First Served
YANG Module Tags
IETF YANG Module Tags	RFC 8819	IETF Review
YANG Module Tag Prefixes	RFC 8819	Specification Required (Expert: Christian Hopps, Lou Berger)
YANG Modules
iana-bfd-types YANG Module	RFC 9127 RFC 5880	See BFD Diagnostic Codes and BFD Authentication Types registries.
iana-bgp-l2-encaps YANG Module	RFC 9291 RFC 6624	See BGP Layer 2 Encapsulation Types registry.
iana-crypt-hash YANG Module	RFC 7317	Expert Review (Expert: Kent Watsen)
iana-dns-class-rr-type YANG Module	RFC 9108	See DNS CLASSes and Resource Record (RR) TYPEs registries.
iana-dots-signal-channel YANG Module	RFC 9132	See the DOTS Status Codes, DOTS Conflict Status Codes, DOTS Conflict Cause Codes, and DOTS Attack Status Codes registries.
iana-hardware YANG Module	RFC 8348	See IANA-ENTITY-MIB MIB module.
iana-http-versions YANG Module	draft-ietf-netconf-http-client-server-31	See the TLS Application-Layer Protocol Negotiation (ALPN) Protocol IDs registry.
iana-icmpv4-types YANG Module	RFC 9899	See ICMP Type Numbers registry.
iana-icmpv6-types YANG Module	RFC 9899	See ICMPv6 "type" Numbers registry.
iana-if-type YANG Module	RFC 1213 RFC 2863 RFC 7224 RFC 8892	This is one of the available formats of the Interface Types (ifType) registry.
iana-ipv6-ext-types YANG Module	RFC 9899	See IPv6 Extension Header Types registry.
iana-msd-types YANG Module	RFC 9702	See the IGP MSD-Types registry.
iana-ospf-functional-cap-bits YANG Module	draft-ietf-lsr-ospf-ls-link-infinity-25	New values must not be directly added to the "iana-ospf-functional-cap-bits" YANG module. They must instead be added to the "OSPF Router Functional Capability Bits" registry in the Open Shortest Path First (OSPF) Parameters registry group.
iana-pseudowire-types YANG Module	RFC 9291 RFC 4446	See MPLS Pseudowire Types registry.
iana-routing-types YANG Module	RFC 8294 RFC 2453 RFC 2677 RFC 2858 RFC 4760	See Address Family Numbers and Subsequent Address Family Identifiers (SAFI) Values registries.
iana-sip-option-tags YANG Module	draft-ietf-asap-sip-auto-peer-40	See the Option Tags registry.
iana-ssh-encryption-algs YANG Module	RFC 9644	See the Encryption Algorithm Names registry.
iana-ssh-key-exchange-algs YANG Module	RFC 9644	See the Key Exchange Method Names registry.
iana-ssh-mac-algs YANG Module	RFC 9644	See the MAC Algorithm Names registry.
iana-ssh-public-key-algs YANG Module	RFC 9644	See the Public Key Algorithm Names registry.
iana-tls-cipher-suite-algs YANG Module	RFC 9645	See the TLS Cipher Suites registry.
iana-tunnel-type YANG Module	RFC 4087 RFC 8675 RFC 8892	This is one of the available formats of the Tunnel Types (tunnelType) registry.
YANG Parameters
YANG Module Names	RFC 6020 RFC 9907 RFC 9890	RFC Required
YANG SIDs
IETF YANG-SID Modules	RFC 9595	Expert Review (Expert: Michel Veillette, Alexander Pelov, Laurent Toutain)
IETF YANG-SID Ranges	RFC 9595	0: IESG Approval 1000: RFC Required (or Expert Review if YANG comes from existing RFC) 60000: Reserved for Experimental Use 100000: RFC Required (or Expert Review if YANG comes from existing RFC) 300000: Reserved
YANG-SID Mega-Ranges	RFC 9595	Expert Review (Expert: Michel Veillette, Alexander Pelov, Laurent Toutain)