DNS Record Types Glossary

Mindwatering Incorporated

Author: Tripp W Black

Created: 05/25/2004 at 11:20 AM

 

Category:
OS X Configuration
Network - DNS

Glossary of Common DNS Record Types

A
Address
Stores the IP address for a domain name.
e.g. 192.168.0.2
CNAME
Canonical Name
Stores the "real" name of a server when given the "nickname" or alias.
e.g. mail.mindwatering.net may have a canonical name of mailsrv1.mindwatering.net
MX
Mail Exchange
Stores the domain name of a mail server (SMTP)
NS
Name Server
Stores the authoritive name server for a given zone.
PTR
Pointer
Stores the domain name of a given IP address (reverse lookup pointers).
Note: Used in reverse order. e.g. 192.168.0.2 would become 0.168.192.
TXT
Text
Stores a text string as a response to a DNS query.
The "complete" list from the IANA site:
http://www.iana.org/assignments/dns-parameters

I suggest you follow the link above as it should contain up-to-date info or a link to the "new" up-to-date info.
However, as links often seem to "die" on me, I have pasted the list below. The source of the list below is the link above.

_______________________________________________________________________-
In the Internet (IN) class the following Resource Record (RR) TYPEs
and QTYPEs are defined:

TYPE            value and meaning                         Reference
----------      --------------------------------------    ---------

A               1 a host address                          [RFC1035]
NS              2 an authoritative name server            [RFC1035]
MD              3 a mail destination (Obsolete - use MX)  [RFC1035]
MF              4 a mail forwarder (Obsolete - use MX)  [RFC1035]
CNAME           5 the canonical name for an alias  [RFC1035]
SOA             6 marks the start of a zone of authority  [RFC1035]
MB              7 a mailbox domain name (EXPERIMENTAL)  [RFC1035]
MG              8 a mail group member (EXPERIMENTAL)  [RFC1035]
MR              9 a mail rename domain name (EXPERIMENTAL)[RFC1035]
NULL            10 a null RR (EXPERIMENTAL)               [RFC1035]
WKS             11 a well known service description       [RFC1035]
PTR             12 a domain name pointer                  [RFC1035]
HINFO           13 host information                       [RFC1035]
MINFO           14 mailbox or mail list information       [RFC1035]
MX              15 mail exchange                          [RFC1035]
TXT             16 text strings                           [RFC1035]

RP              17 for Responsible Person                 [RFC1183]
AFSDB           18 for AFS Data Base location             [RFC1183]
X25             19 for X.25 PSDN address                  [RFC1183]
ISDN            20 for ISDN address                       [RFC1183]
RT              21 for Route Through                      [RFC1183]

NSAP            22 for NSAP address, NSAP style A record  [RFC1706]
NSAP-PTR        23

SIG             24 for security signature                 [RFC2931]
KEY             25 for security key                       [RFC2535]

PX              26 X.400 mail mapping information         [RFC2163]

GPOS            27 Geographical Position                  [RFC1712]

AAAA            28 IP6 Address                            [Thomson]

LOC             29 Location Information                   [Vixie]

NXT             30 Next Domain - OBSOLETE                 [RFC2535, RFC3755]

EID             31 Endpoint Identifier                    [Patton]

NIMLOC          32 Nimrod Locator                         [Patton]

SRV             33 Server Selection                       [RFC2782]

ATMA            34 ATM Address                            [Dobrowski]

NAPTR           35 Naming Authority Pointer               [RFC2168, RFC2915]

KX              36 Key Exchanger                          [RFC2230]

CERT            37 CERT                                   [RFC2538]

A6              38 A6                                     [RFC2874]

DNAME           39 DNAME                                  [RFC2672]

SINK            40 SINK                                   [Eastlake]

OPT             41 OPT                                    [RFC2671]

APL             42 APL                                    [RFC3123]

DS              43 Delegation Signer                      [RFC3658]

SSHFP           44 SSH Key Fingerprint                    [RFC-ietf-secsh-dns-05.txt]

RRSIG           46 RRSIG                                  [RFC3755]
NSEC            47 NSEC                                   [RFC3755]
DNSKEY          48 DNSKEY                                 [RFC3755]

UINFO           100                                       [IANA-Reserved]
UID             101                                       [IANA-Reserved]
GID             102                                       [IANA-Reserved]
UNSPEC          103                                       [IANA-Reserved]

TKEY            249 Transaction Key                       [RFC2930]
TSIG            250 Transaction Signature                 [RFC2845]
IXFR            251 incremental transfer                  [RFC1995]
AXFR            252 transfer of an entire zone            [RFC1035]
MAILB           253 mailbox-related RRs (MB, MG or MR)  [RFC1035]
MAILA           254 mail agent RRs (Obsolete - see MX)  [RFC1035]
*               255 A request for all records  [RFC1035]

Note: In RFC 1002, two types are defined.  It is not clear that these
are in use, though if so their assignment does conflict with those
above.

NB 32 NetBIOS general Name Service
NBSTAT 33 NetBIOS NODE STATUS


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