DNSレコードタイプの一覧

DNSレコードタイプの一覧を以下に示す。Domain Name System（DNS）の内のリソースレコード（RR）の概要である。
また、擬似RR（pseudo-RRs）を含んでいる。

リソースレコード

他のタイプの擬似リソースレコード

廃止されたレコードタイプ 

 Obsoleted by : MD(3), MF (4), MAILA (254)
 Records to publish mailing list subscriber lists in the DNS: MB(7), MG(8), MR(9), MINFO(14), MAILB (253).  The intent, as specified by , was for MB to replace the SMTP VRFY command, MG to replace the SMTP EXPN command, and MR to replace the "551 User Not Local" SMTP error.  Later,  recommended that both the VRFY and EXPN commands be disabled, making the use of MB and MG unlikely to ever be adopted.
 Declared "not to be relied upon" by  (with further information in ): WKS(11)
 Mistakes: NB(32), NBSTAT(33) (from ); the numbers are now assigned to NIMLOC and SRV.
 Obsoleted by : NULL(10)  ( defined "completion queries" (opcode 2 and maybe 3) which used this record,  later reassigned opcode 2 to be "status" and reserved opcode 3.)
 Defined as part of early IPv6 but downgraded to experimental by : A6(38), Later downgraded to historic in .
 Obsoleted by DNSSEC updates (): NXT(30). At the same time, the domain of applicability for KEY and SIG was also limited to not include DNSSEC use.
 Part of the first version of DNSSEC ().
 Not in current use by any notable application: HINFO(13), RP(17), X25(19), ISDN(20), RT(21), NSAP(22), NSAP-PTR(23), PX(26), EID(31), NIMLOC(32), ATMA(34), APL(42)
 Defined by the Kitchen Sink  internet draft, but never made it to RFC status: SINK(40)
 A more limited early version of the LOC record: GPOS(27)
 IANA reserved, no RFC documented them  and support was removed from BIND in the early 90s: UINFO(100), UID(101), GID(102), UNSPEC(103)
 SPF(99) (from ) was specified as part of the Sender Policy Framework protocol as an alternative to storing SPF data in TXT records, using the same format.  It was later found that the majority of SPF deployments lack proper support for this record type, and support for it was discontinued in .

 RP(17) may be used for certain human-readable information regarding a different contact point for a specific host, subnet, or other domain level label separate than that used in the SOA record.

参考

出典・脚注

関連項目 
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