art Applications and Real-Time gen General int Internet irtf Internet Research Task Force ops Operations and Management rtg Routing sec Security tsv Transport wit Web and Internet Transport (historical area name; see also 'art' and 'tsv')

design-rationale Why a design decision was made; usually in non-normative prose errata Known erratum interoperability-note Compatibility constraint with other protocols / versions normative-requirement A MUST/SHOULD/MAY-class normative statement privacy-consideration Item from the Privacy Considerations section protocol-element A defined protocol element (field, message, frame, etc.) registry An IANA registry created or updated by this document security-consideration Item from the Security Considerations section state-machine Defined state transitions wire-format On-the-wire encoding

Editorial Editorial — RFC Editor / process documents IAB IAB — Internet Architecture Board IETF IETF — Standards-track engineering IRTF IRTF — Internet Research Task Force Independent Independent — Independent submissions Legacy Legacy — Pre-stream historical RFCs

acme Certificate issuance / ACME bcp Best Current Practice bgp BGP cbor CBOR censorship Censorship resistance / circumvention congestion Congestion control crypto Cryptography and key exchange diameter Diameter / RADIUS / AAA did Decentralized identifiers diffserv Differentiated services / QoS dns DNS ecn Explicit Congestion Notification email Email (SMTP, IMAP, MIME, DKIM, SPF, DMARC) http HTTP and HTTP/* ip IP / IPv4 / IPv6 ipsec IPsec / IKE jose JOSE (JWT, JWE, JWS) json JSON / data formats ldap LDAP / directory services measurement Network measurement mobility Mobile IP / network mobility mpls MPLS multicast Multicast multipath Multipath transport nat NAT / address translation netconf NETCONF / RESTCONF ntp Time synchronization oauth OAuth / OIDC pcp PCP / NAT control pkix PKIX / X.509 privacy Privacy mechanisms process IETF process / RFC editor qos Quality of service quic QUIC radius RADIUS realtime Real-time media / RTP / SIP registry IANA registries routing Routing (BGP, OSPF, IS-IS, etc.) rtp RTP sctp SCTP security Security (cross-cutting) sip SIP / SIPS snmp SNMP syslog Syslog tcp TCP tls TLS / DTLS udp UDP v6ops IPv6 operations / transition voip VoIP vpn VPN, IPsec, WireGuard webrtc WebRTC and real-time media websocket WebSockets yaml YAML yang YANG / NETCONF / network mgmt zeroconf Zero-config networking