Internet Assigned Numbers Authority iCalendar Element Registries Created 2009-04-29 Last Updated 2023-12-06 Note A Standards Track RFC is required for registration of iCalendar elements that modify elements previously documented in a Standards Track RFC. Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registries included below • Components • Properties • Parameters • Value Data Types • Calendar User Types • Free/Busy Time Types • Participation Statuses • Relationship Types • Participation Roles • Actions • Classifications • Methods • REQUEST-STATUS Values • Schedule Agent Values Registry • Schedule Force Send Values Registry • Display Types • Feature Types • Participant Types • Resource Types • Proximity Values Components Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Component Status Reference VCALENDAR Current [RFC5545, Section 3.4] VEVENT Current [RFC5545, Section 3.6.1] VTODO Current [RFC5545, Section 3.6.2] VJOURNAL Current [RFC5545, Section 3.6.3] VFREEBUSY Current [RFC5545, Section 3.6.4] VTIMEZONE Current [RFC5545, Section 3.6.5] VALARM Current [RFC5545, Section 3.6.6] STANDARD Current [RFC5545, Section 3.6.5] DAYLIGHT Current [RFC5545, Section 3.6.5] VAVAILABILITY Current [RFC7953, Section 3.1] AVAILABLE Current [RFC7953, Section 3.1] PARTICIPANT Current [RFC9073, Section 7.1] VLOCATION Current [RFC9073, Section 7.2] [RFC Errata 7381] VRESOURCE Current [RFC9073, Section 7.3] Properties Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Property Status Reference CALSCALE Current [RFC5545, Section 3.7.1] METHOD Current [RFC5545, Section 3.7.2] PRODID Current [RFC5545, Section 3.7.3] VERSION Current [RFC5545, Section 3.7.4] ATTACH Current [RFC5545, Section 3.8.1.1] CATEGORIES Current [RFC5545, Section 3.8.1.2] [RFC7986, Section 5.6] CLASS Current [RFC5545, Section 3.8.1.3] COMMENT Current [RFC5545, Section 3.8.1.4] DESCRIPTION Current [RFC5545, Section 3.8.1.5] [RFC7986, Section 5.2] GEO Current [RFC5545, Section 3.8.1.6] LOCATION Current [RFC5545, Section 3.8.1.7] PERCENT-COMPLETE Current [RFC5545, Section 3.8.1.8] PRIORITY Current [RFC5545, Section 3.8.1.9] RESOURCES Current [RFC5545, Section 3.8.1.10] STATUS Current [RFC5545, Section 3.8.1.11] SUMMARY Current [RFC5545, Section 3.8.1.12] COMPLETED Current [RFC5545, Section 3.8.2.1] DTEND Current [RFC5545, Section 3.8.2.2] DUE Current [RFC5545, Section 3.8.2.3] DTSTART Current [RFC5545, Section 3.8.2.4] DURATION Current [RFC5545, Section 3.8.2.5] FREEBUSY Current [RFC5545, Section 3.8.2.6] TRANSP Current [RFC5545, Section 3.8.2.7] TZID Current [RFC5545, Section 3.8.3.1] TZNAME Current [RFC5545, Section 3.8.3.2] TZOFFSETFROM Current [RFC5545, Section 3.8.3.3] TZOFFSETTO Current [RFC5545, Section 3.8.3.4] TZURL Current [RFC5545, Section 3.8.3.5] ATTENDEE Current [RFC5545, Section 3.8.4.1] CONTACT Current [RFC5545, Section 3.8.4.2] ORGANIZER Current [RFC5545, Section 3.8.4.3] RECURRENCE-ID Current [RFC5545, Section 3.8.4.4] RELATED-TO Current [RFC5545, Section 3.8.4.5] [RFC9253, Section 9.1] URL Current [RFC5545, Section 3.8.4.6] [RFC7986, Section 5.5] UID Current [RFC5545, Section 3.8.4.7] [RFC7986, Section 5.3] EXDATE Current [RFC5545, Section 3.8.5.1] EXRULE Deprecated [RFC2445, Section 4.8.5.2] RDATE Current [RFC5545, Section 3.8.5.2] RRULE Current [RFC5545, Section 3.8.5.3] ACTION Current [RFC5545, Section 3.8.6.1] REPEAT Current [RFC5545, Section 3.8.6.2] TRIGGER Current [RFC5545, Section 3.8.6.3] CREATED Current [RFC5545, Section 3.8.7.1] DTSTAMP Current [RFC5545, Section 3.8.7.2] LAST-MODIFIED Current [RFC5545, Section 3.8.7.3] [RFC7986, Section 5.4] SEQUENCE Current [RFC5545, Section 3.8.7.4] REQUEST-STATUS Current [RFC5545, Section 3.8.8.3] XML Current [RFC6321, Section 4.2] TZUNTIL Current [RFC7808, Section 7.1] TZID-ALIAS-OF Current [RFC7808, Section 7.2] BUSYTYPE Current [RFC7953, Section 3.2] NAME Current [RFC7986, Section 5.1] REFRESH-INTERVAL Current [RFC7986, Section 5.7] SOURCE Current [RFC7986, Section 5.8] COLOR Current [RFC7986, Section 5.9] IMAGE Current [RFC7986, Section 5.10] CONFERENCE Current [RFC7986, Section 5.11] CALENDAR-ADDRESS Current [RFC9073, Section 6.4] LOCATION-TYPE Current [RFC9073, Section 6.1] PARTICIPANT-TYPE Current [RFC9073, Section 6.2] RESOURCE-TYPE Current [RFC9073, Section 6.3] STRUCTURED-DATA Current [RFC9073, Section 6.6] STYLED-DESCRIPTION Current [RFC9073, Section 6.5] ACKNOWLEDGED Current [RFC9074, Section 6.1] PROXIMITY Current [RFC9074, Section 8.1] CONCEPT Current [RFC9253, Section 8.1] LINK Current [RFC9253, Section 8.2] REFID Current [RFC9253, Section 8.3] Parameters Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Parameter Status Reference ALTREP Current [RFC5545, Section 3.2.1] CN Current [RFC5545, Section 3.2.2] CUTYPE Current [RFC5545, Section 3.2.3] DELEGATED-FROM Current [RFC5545, Section 3.2.4] DELEGATED-TO Current [RFC5545, Section 3.2.5] DIR Current [RFC5545, Section 3.2.6] ENCODING Current [RFC5545, Section 3.2.7] FMTTYPE Current [RFC5545, Section 3.2.8] FBTYPE Current [RFC5545, Section 3.2.9] LANGUAGE Current [RFC5545, Section 3.2.10] MEMBER Current [RFC5545, Section 3.2.11] PARTSTAT Current [RFC5545, Section 3.2.12] RANGE Current [RFC5545, Section 3.2.13] RELATED Current [RFC5545, Section 3.2.14] RELTYPE Current [RFC5545, Section 3.2.15] ROLE Current [RFC5545, Section 3.2.16] RSVP Current [RFC5545, Section 3.2.17] SCHEDULE-AGENT Current [RFC6638, Section 7.1] SCHEDULE-FORCE-SEND Current [RFC6638, Section 7.2] SCHEDULE-STATUS Current [RFC6638, Section 7.3] SENT-BY Current [RFC5545, Section 3.2.18] TZID Current [RFC5545, Section 3.2.19] VALUE Current [RFC5545, Section 3.2.20] DISPLAY Current [RFC7986, Section 6.1] EMAIL Current [RFC7986, Section 6.2] FEATURE Current [RFC7986, Section 6.3] LABEL Current [RFC7986, Section 6.4] SIZE Current [RFC8607, Section 4.1] FILENAME Current [RFC8607, Section 4.2] MANAGED-ID Current [RFC8607, Section 4.3] ORDER Current [RFC9073, Section 5.1] SCHEMA Current [RFC9073, Section 5.2] DERIVED Current [RFC9073, Section 5.3] GAP Current [RFC9253, Section 6.2] LINKREL Current [RFC9253, Section 6.1] Value Data Types Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Note A Standards Track RFC is REQUIRED for the registration of new Value Data Types that modify existing properties. Available Formats [IMG] CSV Value Data Type Status Reference BINARY Current [RFC5545, Section 3.3.1] BOOLEAN Current [RFC5545, Section 3.3.2] CAL-ADDRESS Current [RFC5545, Section 3.3.3] DATE Current [RFC5545, Section 3.3.4] DATE-TIME Current [RFC5545, Section 3.3.5] DURATION Current [RFC5545, Section 3.3.6] FLOAT Current [RFC5545, Section 3.3.7] INTEGER Current [RFC5545, Section 3.3.8] PERIOD Current [RFC5545, Section 3.3.9] RECUR Current [RFC5545, Section 3.3.10] TEXT Current [RFC5545, Section 3.3.11] TIME Current [RFC5545, Section 3.3.12] UNKNOWN Reserved - Do not use [RFC7265, Section 5] URI Current [RFC5545, Section 3.3.13] UTC-OFFSET Current [RFC5545, Section 3.3.14] XML-REFERENCE Current [RFC9253, Section 7] UID Current [RFC9253, Section 7] Calendar User Types Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Calendar User Type Status Reference INDIVIDUAL Current [RFC5545, Section 3.2.3] GROUP Current [RFC5545, Section 3.2.3] RESOURCE Current [RFC5545, Section 3.2.3] ROOM Current [RFC5545, Section 3.2.3] UNKNOWN Current [RFC5545, Section 3.2.3] Free/Busy Time Types Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Free/Busy Time Type Status Reference FREE Current [RFC5545, Section 3.2.9] BUSY Current [RFC5545, Section 3.2.9] BUSY-UNAVAILABLE Current [RFC5545, Section 3.2.9] BUSY-TENTATIVE Current [RFC5545, Section 3.2.9] Participation Statuses Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Note A Standards Track RFC is REQUIRED for the registration of Participation Status values to be used in "VEVENT" calendar components. Available Formats [IMG] CSV Participation Status Status Reference NEEDS-ACTION Current [RFC5545, Section 3.2.12] ACCEPTED Current [RFC5545, Section 3.2.12] DECLINED Current [RFC5545, Section 3.2.12] TENTATIVE Current [RFC5545, Section 3.2.12] DELEGATED Current [RFC5545, Section 3.2.12] COMPLETED Current [RFC5545, Section 3.2.12] IN-PROCESS Current [RFC5545, Section 3.2.12] Relationship Types Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Relationship Type Status Reference CHILD Current [RFC5545, Section 3.2.15] PARENT Current [RFC5545, Section 3.2.15] SIBLING Current [RFC5545, Section 3.2.15] SNOOZE Current [RFC9074, Section 7.1] CONCEPT Current [RFC9253, Section 5] DEPENDS-ON Current [RFC9253, Section 5] FINISHTOFINISH Current [RFC9253, Section 4] FINISHTOSTART Current [RFC9253, Section 4] FIRST Current [RFC9253, Section 5] NEXT Current [RFC9253, Section 5] REFID Current [RFC9253, Section 5] STARTTOFINISH Current [RFC9253, Section 4] STARTTOSTART Current [RFC9253, Section 4] Participation Roles Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Role Type Status Reference CHAIR Current [RFC5545, Section 3.2.16] REQ-PARTICIPANT Current [RFC5545, Section 3.2.16] OPT-PARTICIPANT Current [RFC5545, Section 3.2.16] NON-PARTICIPANT Current [RFC5545, Section 3.2.16] Actions Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Action Status Reference AUDIO Current [RFC5545, Section 3.8.6.1] DISPLAY Current [RFC5545, Section 3.8.6.1] EMAIL Current [RFC5545, Section 3.8.6.1] PROCEDURE Deprecated [RFC2445, Section 4.8.6.1] Classifications Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Classification Status Reference PUBLIC Current [RFC5545, Section 3.8.1.3] PRIVATE Current [RFC5545, Section 3.8.1.3] CONFIDENTIAL Current [RFC5545, Section 3.8.1.3] Methods Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5545] Available Formats [IMG] CSV Method Status Reference PUBLISH Current [RFC5546] REQUEST Current [RFC5546] REPLY Current [RFC5546] ADD Current [RFC5546] CANCEL Current [RFC5546] REFRESH Current [RFC5546] COUNTER Current [RFC5546] DECLINECOUNTER Current [RFC5546] REQUEST-STATUS Values Registration Procedure(s) Expert Review with RFC Required Expert(s) Bernard Desruisseaux, Ken Murchison, Mike Douglass Reference [RFC5546] Available Formats [IMG] CSV Status Code Status Reference 1.0 Current [RFC6638, Section 3.2.9.1] 1.1 Current [RFC6638, Section 3.2.9.2] 1.2 Current [RFC6638, Section 3.2.9.3] 2.0 Current [RFC5546, Section 3.6.1] 2.1 Current [RFC5546, Section 3.6.2] 2.2 Current [RFC5546, Section 3.6.3] 2.3 Current [RFC5546, Section 3.6.4] 2.4 Current [RFC5546, Section 3.6.5] 2.5 Current [RFC5546, Section 3.6.6] 2.6 Current [RFC5546, Section 3.6.7] 2.7 Current [RFC5546, Section 3.6.8] 2.8 Current [RFC5546, Section 3.6.9] 2.9 Current [RFC5546, Section 3.6.10] 2.10 Current [RFC5546, Section 3.6.11] 2.11 Current [RFC5546, Section 3.6.12] 3.0 Current [RFC5546, Section 3.6.13] 3.1 Current [RFC5546, Section 3.6.14] 3.2 Current [RFC5546, Section 3.6.15] 3.3 Current [RFC5546, Section 3.6.16] 3.4 Current [RFC5546, Section 3.6.17] 3.5 Current [RFC5546, Section 3.6.18] 3.6 Current [RFC5546, Section 3.6.19] 3.7 Current [RFC5546, Section 3.6.20] 3.8 Current [RFC5546, Section 3.6.21] 3.9 Current [RFC5546, Section 3.6.22] 3.10 Current [RFC5546, Section 3.6.23] 3.11 Current [RFC5546, Section 3.6.24] 3.12 Current [RFC5546, Section 3.6.25] 3.13 Current [RFC5546, Section 3.6.26] 3.14 Current [RFC5546, Section 3.6.27] 4.0 Current [RFC5546, Section 3.6.28] 5.0 Current [RFC5546, Section 3.6.29] 5.1 Current [RFC5546, Section 3.6.30] 5.2 Current [RFC5546, Section 3.6.31] 5.3 Current [RFC5546, Section 3.6.32] Schedule Agent Values Registry Registration Procedure(s) Expert Review with RFC Required Expert(s) Unassigned Reference [RFC6638] Available Formats [IMG] CSV Schedule Agent Status Reference SERVER Current [RFC6638, Section 7.1] CLIENT Current [RFC6638, Section 7.1] NONE Current [RFC6638, Section 7.1] Schedule Force Send Values Registry Registration Procedure(s) Expert Review with RFC Required Expert(s) Unassigned Reference [RFC6638] Available Formats [IMG] CSV Schedule Force Send Status Reference REQUEST Current [RFC6638, Section 7.2] REPLY Current [RFC6638, Section 7.2] Display Types Registration Procedure(s) Expert Review with RFC Required Expert(s) Unassigned Reference [RFC7986] Available Formats [IMG] CSV Display Type Status Reference BADGE Current [RFC7986, Section 6.1] GRAPHIC Current [RFC7986, Section 6.1] FULLSIZE Current [RFC7986, Section 6.1] THUMBNAIL Current [RFC7986, Section 6.1] Feature Types Registration Procedure(s) Expert Review with RFC Required Expert(s) Unassigned Reference [RFC7986] Available Formats [IMG] CSV Name Status Reference AUDIO Current [RFC7986, Section 6.3] CHAT Current [RFC7986, Section 6.3] FEED Current [RFC7986, Section 6.3] MODERATOR Current [RFC7986, Section 6.3] PHONE Current [RFC7986, Section 6.3] SCREEN Current [RFC7986, Section 6.3] VIDEO Current [RFC7986, Section 6.3] Participant Types Registration Procedure(s) Expert Review Expert(s) Ken Murchison, Michael Douglass Reference [RFC9073] Available Formats [IMG] CSV Participant Type Status Reference ACTIVE Current [RFC9073, Section 6.2] INACTIVE Current [RFC9073, Section 6.2] SPONSOR Current [RFC9073, Section 6.2] CONTACT Current [RFC9073, Section 6.2] BOOKING-CONTACT Current [RFC9073, Section 6.2] EMERGENCY-CONTACT Current [RFC9073, Section 6.2] PUBLICITY-CONTACT Current [RFC9073, Section 6.2] PLANNER-CONTACT Current [RFC9073, Section 6.2] PERFORMER Current [RFC9073, Section 6.2] SPEAKER Current [RFC9073, Section 6.2] Resource Types Registration Procedure(s) Expert Review Expert(s) Ken Murchison, Michael Douglass Reference [RFC9073] Available Formats [IMG] CSV Resource Type Status Reference PROJECTOR Current [RFC9073, Section 6.3] ROOM Current [RFC9073, Section 6.3] REMOTE-CONFERENCE-AUDIO Current [RFC9073, Section 6.3] REMOTE-CONFERENCE-VIDEO Current [RFC9073, Section 6.3] Proximity Values Registration Procedure(s) Expert Review with RFC Required Expert(s) Ken Murchison, Michael Douglass Reference [RFC9074] Available Formats [IMG] CSV Value Status Reference ARRIVE Current [RFC9074, Section 8.1] DEPART Current [RFC9074, Section 8.1] CONNECT Current [RFC9074, Section 8.1] DISCONNECT Current [RFC9074, Section 8.1] Licensing Terms