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  2. List of DNS record types - Wikipedia

    en.wikipedia.org/wiki/List_of_DNS_record_types

    10 RFC 883 RFC 1035 Obsoleted by RFC 1035. RFC 883 defined "completion queries" (opcode 2 and maybe 3) which used this record. RFC 1035 later reassigned opcode 2 to be "status" and reserved opcode 3. A6 38 RFC 2874 RFC 6563 Defined as part of early IPv6 but downgraded to experimental by RFC 3363; later downgraded to historic by RFC 6563. NXT 30