Port 853 — domain-s

DNS query-response protocol run over TLS

Transport protocols: tcp, udp

Registered Services

• domain-s / tcp — DNS query-response protocol run over TLS (RFC7858)
• domain-s / udp — DNS query-response protocol run over DTLS or QUIC (RFC7858][RFC8094][RFC9250)

Assignment from the IANA Service Name and Transport Protocol Port Number Registry.