6. IANA Considerations

IANA has added the following value to the "Service Name and Transport Protocol Port Number Registry" in the System Range. The registry for that range requires IETF Review or IESG Approval [RFC6335], and such a review was requested using the early allocation process [RFC7120] for the well-known TCP port in this document.

IANA has reserved the same port number over UDP for the proposed DNS-over-DTLS protocol [DNSoD].

Service Name           domain-s
Port Number            853
Transport Protocol(s)  TCP/UDP
Assignee               IESG
Contact                IETF Chair
Description            DNS query-response protocol run over TLS/DTLS
Reference              This document

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