List of DNS record types Totally Explained

Everything about List Of Dns Record Types totally explained

This List of DNS record types provides a convenient index to information about the various kinds of DNS records. Types of information stored in DNS include the following:

Code	Number	Defining RFC	Description	Function
A	1	RFC 1035	address record	maps a hostname to a 32-bit IPv4 address.
AAAA	28	RFC 3596	IPv6 address record	maps a hostname to a 128-bit IPv6 address.
AXFR	252	RFC 1035	Full Zone Transfer	Transfer the entire zone file from the master name server to secondary name servers.
CERT	37	RFC 4398	Certificate record	can store PKIX, SPKI, PGP, etc.
CNAME	5	RFC 1035	canonical name record	is an alias of one name to another. The A record to which the alias points can be either local or remote - on a foreign name server. This is useful when running multiple services (like an FTP and a webserver) from a single IP address. Each service can then have its own entry in DNS (like `ftp.example.com.` and `www.example.com.`). It is also used when running multiple HTTP servers, with different names, on the same physical host.
DHCID	49	RFC 4701	DHCP identifier	Used in conjuction with the FQDN option to DHCP
DLV	32769	RFC 4431	DNSSEC Lookaside Validation record	for publishing DNSSEC trust anchors outside of the DNS delegation chain.
DNAME	39	RFC 2672	delegation name	Unlike the CNAME record which creates a single alias, a DNAME will delegate an entire portion of the DNS tree under a new name.
DNSKEY	48	RFC 3755	DNS Key record	The key record used in DNSSEC
DS	43	RFC 3658	Delegation signer	The record used to identify the DNSSEC signing key of a delegated zone
HIP	55	RFC 5205	Host Identity Protocol	a method of separating the end-point identifier and locator roles of IP addresses.
IPSECKEY	45	RFC 4025	IPSEC Key	Key record that can be used with IPSEC
IXFR	251	RFC 1995	Incremental Zone Transfer	Transfer the changed parts of the zone file from the master name server to secondary name servers.
KEY	25	RFC 4034	Key record	Used only for TKEY (RFC 2930). Before RFC 3755 was published, this was also used for DNSSEC, but DNSSEC now uses DNSKEY.
LOC	29	RFC 1876	Location record	Specifies a geographical location associated with a domain name.
MX	15	RFC 1035	mail exchange record	maps a domain name to a list of mail exchange servers for that domain.
NAPTR	35	RFC 3403	Naming Authority Pointer	a newer type of DNS record that support regular expression based rewriting.
NS	2	RFC 1035	name server record	delegates a DNS zone to be use the given authoritative name servers
NSEC	47	RFC 3755	Next-Secure record	Part of DNSSEC. Used to prove that a name doesn't exist.
NSEC3PARAM	51	RFC 5155	NSEC3 parameters	Parameter record for use with NSEC3
OPT	41	RFC 2671	Option	This is a "pseudo DNS record type" needed to support EDNS
PTR	12	RFC 1035	pointer record	maps an IPv4 address to the canonical name for that host. Setting up a PTR record for a hostname in the `in-addr.arpa.` domain that corresponds to an IP address implements reverse DNS lookup for that address. For example (at the time of writing), `www.icann.net` has the IP address 192.0.34.164, but a PTR record maps `164.34.0.192.in-addr.arpa` to its canonical name, `referrals.icann.org`.
RRSIG	46	RFC 3755	DNSSEC signature	Signature for a DNSSEC-secured record set
SIG	24	RFC 2535	Signature	Signature record used in SIG(0) (RFC 2931). Until RFC 3755 was published, the SIG record was part of DNSSEC; now RRSIG is used for that.
SOA	6	RFC 1035	start of authority record	specifies the DNS server providing authoritative information about an Internet domain, the email of the domain administrator, the domain serial number, and several timers relating to refreshing the zone.
SPF	99	RFC 4408	SPF record	Specified as part of the SPF protocol, as an alternative to storing SPF data in TXT records.
SRV	33	RFC 2872	Service locator	a generalized service location record, used for newer protocols instead of creating protocol-specific records such as MX.
SSHFP	44	RFC 4255	SSH Public Key Fingerprint	a resource record for publishing SSH public host key fingerprints in the DNS System, in order to aid in verifying the authenticity of the host.
TA	32768	None	DNSSEC Trust Authorities	Part of a deployment proposal for DNSSEC without a signed DNS root. See the IANA database and Weiler Spec] for details
TKEY	249	RFC 2930	Transaction Key	a record that supports one set of security mechanisms for the DNS.
TSIG	250	RFC 2845	Transaction Signature	a record that supports one set of security mechanisms for DNS.
TXT	16	RFC 1035	Text record	originally intended to carry arbitrary human-readable text in a DNS record. Since the early 1990s, however, this record is more often used to carry machine-readable data such as specified by RFC 1464, opportunistic encryption, Sender Policy Framework and DomainKeys.

Other types

Other types of records simply provide information, or experimental data (for example, a WKS record gives a list of servers offering some well known service such as HTTP or POP3 for a domain). Several of these record types are obsolete.
The "type" field is also used in the protocol for various operations; type 255 is a request for "all records of all types", 252 (AXFR) is a request for transfer of a zone, TKEY and TSIG are used for transaction signing (which is different from record signing).

Obsolete record types

Of the records listed at IANA, some are unlikely to be useful, for various reasons. Some are marked obsolete in the list, some are for very obscure services, some are for older versions of services, and some have special notes saying they're "not right".

Obsolete: MD(3), MF (4), NXT(30), MAILB (253), MAILA (254)
Mistakes: NB(32), NBSTAT(33) (from RFC 1002); the numbers are now assigned to NIMLOC and SRV.
Obscure: AFSDB(18), X25(19), ISDN(20), RT(21), NSAP(22), NSAP-PTR(23), PX(26), EID(31), NIMLOC(32), ATMA(34), KX(36), A6(38)
Experimental: MB(7), MG(8), MR(9), NULL(10)
Obsoleted by DNSSEC updates (RFC 3755): NXT(30). The domain of applicability for KEY and SIG was also limited to not include DNSSEC use.
Not in current use: WKS(11), HINFO(13), MINFO(14), RP(17), GPOS(27), SINK(40), APL(42)
IANA reserved: UINFO(100), UID(101), GID(102), UNSPEC(103)

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