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,TLS Encrypted ClientHello Config,IETF,[RFC-ietf-tls-svcb-ech-08]
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,tls-supported-groups,Supported groups in TLS,IETF,"[draft-ietf-tls-key-share-prediction-01, Section 3.1]"
10,docpath,DNS over CoAP resource path,IETF,"[RFC-ietf-core-dns-over-coap-19, Section 3]"
11-65279,Unassigned,,,
65280-65534,N/A,Reserved for Private Use,IETF,[RFC9460]
65535,N/A,"Reserved (""Invalid key"")",IETF,[RFC9460]