Internet Assigned Numbers Authority • Domains • Protocols • Numbers • About UDP Speed Test Protocol (UDPSTP) Created 2025-09-26 Last Updated 2026-03-31 Note Values reserved for Experimental Use are not expected to be used on the Internet but are expected to be used for experiments that are confined to closed environments. Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registries Included Below • PDU Identifier • Protocol Version • Test Setup PDU Modifier Bitmap • Test Setup PDU Authentication Mode • Test Setup PDU Command Response Field • Test Activation PDU Command Request • Test Activation PDU Modifier Bitmap • Test Activation PDU Rate Adjustment Algo • Test Activation PDU Command Response Field PDU Identifier Expert(s) Unassigned Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 0x0000 Reserved 0x0001-0x7F00 Specification Required 0x7F01-0x7FE0 Experimental Use 0x7FE1-0x7FFF Private Use 0x8000-0xFFFE IETF Review 0xFFFF Reserved Value Description Reference Change Controller 0x0000 Reserved [RFC-ietf-ippm-capacity-protocol-25] IETF 0x7F01-0x7FE0 Reserved for Experimental Use [RFC-ietf-ippm-capacity-protocol-25] IETF 0x7FE1-0x7FFF Reserved for Private Use [RFC-ietf-ippm-capacity-protocol-25] IETF 0xACE1 Test Setup PDU [RFC-ietf-ippm-capacity-protocol-25] IETF 0xACE2 Test Activation PDU [RFC-ietf-ippm-capacity-protocol-25] IETF 0xBEEF Load PDU [RFC-ietf-ippm-capacity-protocol-25] IETF 0xDEAD Null PDU [RFC-ietf-ippm-capacity-protocol-25] IETF 0xFEED Status Feedback PDU [RFC-ietf-ippm-capacity-protocol-25] IETF 0xFFFF Reserved [RFC-ietf-ippm-capacity-protocol-25] IETF Protocol Version Expert(s) Unassigned Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 0-19 Reserved 20-40960 IETF Review 40961-53248 Specification Required 53249-65534 Experimental Use 65535 Reserved Value Reference Change Controller 20 [RFC-ietf-ippm-capacity-protocol-25] IETF Test Setup PDU Modifier Bitmap Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 00000000-01111111 IETF Review 10000000 Reserved Value Description Reference 0x00 No modifications [RFC-ietf-ippm-capacity-protocol-25] 0x01 Allow Jumbo datagram sizes above sending rates of 1 Gbps [RFC-ietf-ippm-capacity-protocol-25] 0x02 Use Traditional MTU (1500 bytes with an IP header) [RFC-ietf-ippm-capacity-protocol-25] Test Setup PDU Authentication Mode Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 0-59 IETF Review 60-63 Experimental Use 64-255 Reserved Value Description Reference 0 Not used [RFC-ietf-ippm-capacity-protocol-25] 1 Required authentication for the Control phase [RFC-ietf-ippm-capacity-protocol-25] 2 Optional authentication for the Data phase, in addition to the Control phase [RFC-ietf-ippm-capacity-protocol-25] Test Setup PDU Command Response Field Expert(s) Unassigned Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 0-127 IETF Review 128-239 Specification Required 240-249 Experimental Use 250-254 Private Use 255 Reserved Value Description Reference Change Controller 0 None (used by client in Request) [RFC-ietf-ippm-capacity-protocol-25] IETF 1 Acknowledgment [RFC-ietf-ippm-capacity-protocol-25] IETF 2 Bad protocol version [RFC-ietf-ippm-capacity-protocol-25] IETF 3 Invalid Jumbo datagram option [RFC-ietf-ippm-capacity-protocol-25] IETF 4 Unexpected authentication in Setup Request [RFC-ietf-ippm-capacity-protocol-25] IETF 5 Authentication missing in Setup Request [RFC-ietf-ippm-capacity-protocol-25] IETF 6 Invalid authentication method [RFC-ietf-ippm-capacity-protocol-25] IETF 7 Authentication failure [RFC-ietf-ippm-capacity-protocol-25] IETF 8 Authentication time is invalid in Setup Request [RFC-ietf-ippm-capacity-protocol-25] IETF 9 No maximum test bit rate specified [RFC-ietf-ippm-capacity-protocol-25] IETF 10 Server maximum bit rate exceeded [RFC-ietf-ippm-capacity-protocol-25] IETF 11 MTU option does not match server [RFC-ietf-ippm-capacity-protocol-25] IETF 12 Multi-connection parameters rejected by server [RFC-ietf-ippm-capacity-protocol-25] IETF 13 Connection allocation failure on server [RFC-ietf-ippm-capacity-protocol-25] IETF 14-239 Unassigned 240-249 Reserved for Experimental Use [RFC-ietf-ippm-capacity-protocol-25] IETF 250-254 Reserved for Private Use [RFC-ietf-ippm-capacity-protocol-25] IETF 255 Reserved [RFC-ietf-ippm-capacity-protocol-25] IETF Test Activation PDU Command Request Expert(s) Unassigned Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 0-127 IETF Review 128-239 Specification Required 240-249 Experimental Use 250-254 Private Use 255 Reserved Value Description Reference Change Controller 0 No Request [RFC-ietf-ippm-capacity-protocol-25] IETF 1 Request test in upstream direction (client to server) [RFC-ietf-ippm-capacity-protocol-25] IETF 2 Request test in downstream direction (server to client) [RFC-ietf-ippm-capacity-protocol-25] IETF 3-239 Unassigned 240-249 Reserved for Experimental Use [RFC-ietf-ippm-capacity-protocol-25] IETF 250-254 Reserved for Private Use [RFC-ietf-ippm-capacity-protocol-25] IETF 255 Reserved [RFC-ietf-ippm-capacity-protocol-25] IETF Test Activation PDU Modifier Bitmap Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 00000000-01111111 IETF Review 10000000 Reserved Value Description Reference 0x00 No modifications [RFC-ietf-ippm-capacity-protocol-25] 0x01 Set when srIndexConf is start rate for search [RFC-ietf-ippm-capacity-protocol-25] 0x02 Set for randomized UDP payload [RFC-ietf-ippm-capacity-protocol-25] Test Activation PDU Rate Adjustment Algo Reference [RFC-ietf-ippm-capacity-protocol-25] Note The algorithm identifier is a capitalized alphabetic UTF-8 value (A-Z), specified by the corresponding incremental numeric. Available Formats [IMG] CSV Range Registration Procedures A-Y IETF Review Z Reserved Value (Numeric) Description Reference A(n/a) Not used [RFC-ietf-ippm-capacity-protocol-25] B(0) Rate algorithm Type B [Y.1540Amd2] C(1) Rate algorithm Type C [TR-471] Test Activation PDU Command Response Field Expert(s) Unassigned Reference [RFC-ietf-ippm-capacity-protocol-25] Available Formats [IMG] CSV Range Registration Procedures 0-127 IETF Review 128-239 Specification Required 240-249 Experimental Use 250-254 Private Use 255 Reserved Value Description Reference Change Controller 0 None (used by client in Request) [RFC-ietf-ippm-capacity-protocol-25] IETF 1 Server acknowledgment [RFC-ietf-ippm-capacity-protocol-25] IETF 2 Server indicates an error [RFC-ietf-ippm-capacity-protocol-25] IETF 3-239 Unassigned 240-249 Reserved for Experimental Use [RFC-ietf-ippm-capacity-protocol-25] IETF 250-254 Reserved for Private Use [RFC-ietf-ippm-capacity-protocol-25] IETF 255 Reserved [RFC-ietf-ippm-capacity-protocol-25] IETF Licensing Terms