Internet Assigned Numbers Authority DNS Service Bindings (SVCB) Created 2022-05-26 Last Updated 2024-02-23 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registry included below • Service Parameter Keys (SvcParamKeys) Service Parameter Keys (SvcParamKeys) Expert(s) Benjamin Schwartz, David Lawrence Reference [RFC9460] Available Formats [IMG] CSV Range Registration Procedures 0-65279 Expert Review 65280-65534 Private Use Number Name Meaning Change Controller Reference 0 mandatory Mandatory keys in this RR IETF [RFC9460, Section 8] 1 alpn Additional supported protocols IETF [RFC9460, Section 7.1] 2 no-default-alpn No support for default protocol IETF [RFC9460, Section 7.1] 3 port Port for alternative endpoint IETF [RFC9460, Section 7.2] 4 ipv4hint IPv4 address hints IETF [RFC9460, Section 7.3] 5 ech RESERVED (held for Encrypted ClientHello) IETF [RFC9460] 6 ipv6hint IPv6 address hints IETF [RFC9460, Section 7.3] 7 dohpath DNS over HTTPS path template IETF [RFC9461] 8 ohttp Denotes that a service operates an Oblivious HTTP target IETF [RFC9540, Section 4] 9-65279 Unassigned 65280-65534 N/A Reserved for Private Use IETF [RFC9460] 65535 N/A Reserved ("Invalid key") IETF [RFC9460] Licensing Terms