DNS RECORD TYPES

DNS Record Types

A full list of DNS Record Types may be obtained from IANA DNS Parameters.

RR	Value	RFC	Description
A	1	RFC 1035	IPv4 Address record. An IPv4 address for a host.
AAAA	28	RFC 3596	IPv6 Address record. An IPv6 address for a host. Current IETF recommendation for IPv6 forward-mapped zones.
A6	38	RFC 2874	Experimental. Forward mapping of IPv6 addresses. An IP address for a host within the zone.
AFSDB	18	RFC 1183	Location of AFS servers. Experimental - special apps only.
CNAME	5	RFC 1035	Canonical Name. An alias name for a host.
DNAME	39	RFC 2672	Experimental. Delegation of reverse addresses (primarily IPv6).
DNSKEY	48	RFC 4034	DNSSEC.bis. DNS public key RR.
DS	43	RFC 4034	DNSSEC.bis. Delegated Signer RR.
HINFO	13	RFC 1035	Host Information - optional text data about a host.
ISDN	20	RFC 1183	ISDN address. Experimental = special applications only.
KEY	25	RFC 2535	Public key associated with a DNS name.
LOC	29	RFC 1876	Stores GPS data. Experimental - widely used.
MX	15	RFC 1035	Mail Exchanger. A preference value and the host name for a mail server/exchanger that will service this zone. RFC 974 defines valid names.
NAPTR	35	RFC 3403	Naming Authority Pointer Record. Gross misnomer. General purpose definition of rule set to be used by applications e.g. VoIP
NS	2	RFC 1035	Name Server. Defines the authoritative name server(s) for the domain (defined by the SOA record) or the subdomain.
NSEC	47	RFC 4034	DNSSEC.bis. Next Secure record. Ssed to provide proof of non-existence of a name.
NXT	30		DNSSEC Next Domain record type. Obsolete use NSEC.
PTR	12	RFC 1035	IP address (IPv4 or IPv6) to host. Used inreverse maps.
RP	17	RFC 1183	Information about responsible person. Experimental - special apps only.
RRSIG	46	RFC 4034	DNSSEC.bis. Signed RRset.
RT	21	RFC 1183	Through-route binding. Experimental - special apps only.
SIG	24	RFC 2931//2535	DNSSEC. Obsolete use RRSIG. SIG(0) is used as a special meta RR in DDNS and zone transfer security.
SOA	6	RFC 1035	Start of Authority. Defines the zone name, an e-mail contact and various time and refresh values applicable to the zone.
SPF	99	RFC 4408	Sender Policy Framework (v1). Defines the servers which are authorized to send mail for a domain. Its primary function is to prevent identity theft by spammers.
SRV	33	RFC 2872	Defines services available in the zone, for example, ldap, http etc..
TXT	16	RFC 1035	Text information associated with a name. The SPF record should be defined using a TXT record and may (as of April 2006) be defined using an SPF RR. DKIM (RFC 4871also makes use of the TXT RR for authenticaing email. How to define DKIM/ADSP RRs.
WKS	11	RFC 1035	Well Known Services. Deprecated in favour of SRV.
X25	19	RFC 1183	X.25 address. Experimental - special apps only.

Zone File Directives

$ORIGIN
$INCLUDE
$TTL
$GENERATE (non-standard BIND only)