RFC 1035
lastmod 2026-11-10created 2023-02-084 edits
RFC 1035 is the IETF standard document that defines the implementation and specification of the Domain Name System (DNS). It covers the DNS message header and query/response formats, the data structures of resource record types such as A, NS, CNAME, MX, and SOA, the name compression scheme, the master file (zone file) syntax, and the rules for UDP and TCP transport. Together with RFC 1034, which explains the concepts, it forms the core specification of DNS.
DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION