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DOMAIN NAME SYSTEM PARAMETERS
The Internet Domain Naming System (DNS) includes several parameters.
These are documented in [RFC1034] and [RFC1035]. The CLASS parameter
is listed here. The per CLASS parameters are defined in separate RFCs
as indicated.
Domain Name System (DNS) IANA Considerations - [RFC2929]
Domain System Class:
Decimal Name References
--------- ---- ----------
0 Reserved [IANA]
1 Internet (IN) [RFC1035]
2 Unassigned [IANA]
3 Chaos (CH) [RFC1035]
4 Hesiod (HS) [RFC1035]
5-253 Unassigned [IANA]
254 None [RFC2136]
255 Any [QCLASS Only] [RFC1035]
256-65534 Unassigned [IANA]
65535 Reserved [IANA]
In the Internet (IN) class the following Resource Record (RR) TYPEs
and QTYPEs are defined:
TYPE value and meaning
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 [RFC2535]
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 [RFC2535]
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 [RFCXXXX]
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
Domain System Operation Code:
OpCode Name References
------ ---- ----------
0 Query [RFC1035]
1 IQuery [RFC1035]
2 Status [RFC1035]
3 reserved [IANA]
4 Notify [RFC1996]
5 Update [RFC2136]
6-15 available for assignment
Domain System Response Code:
RCODE Name References
----- ---- ----------
0 NoError No Error [RFC1035]
1 FormErr Format Error [RFC1035]
2 ServFail Server Failure [RFC1035]
3 NXDomain Non-Existent Domain [RFC1035]
4 NotImp Not Implemented [RFC1035]
5 Refused Query Refused [RFC1035]
6 YXDomain Name Exists when it should not [RFC2136]
7 YXRRSet RR Set Exists when it should not [RFC2136]
8 NXRRSet RR Set that should exist does not [RFC2136]
9 NotAuth Server Not Authoritative for zone [RFC2136]
10 NotZone Name not contained in zone [RFC2136]
11-15 available for assignment
16 BADVERS Bad OPT Version [RFC2671]
16 BADSIG TSIG Signature Failure [RFC2845]
17 BADKEY Key not recognized [RFC2845]
18 BADTIME Signature out of time window [RFC2845]
19 BADMODE Bad TKEY Mode [RFC2930]
20 BADNAME Duplicate key name [RFC2930]
21 BADALG Algorithm not supported [RFC2930]
22-3840 available for assignment
0x0016-0x0F00
3841-4095 Private Use
0x0F01-0x0FFF
4096-65535 available for assignment
0x1000-0xFFFF
REFERENCES
[RFC1034] Mockapetris, P., "Domain Names - Concepts and
Facilities", STD 13, RFC 1034, USC/Information Sciences
Institute, November 1987.
[RFC1035] Mockapetris, P., "Domain Names - Implementation and
Specification", STD 13, RFC 1035, USC/Information Sciences
Institute, November 1987.
[RFC1183] Everhart, C., Mamakos, L., Ullmann, R., and P. Mockapetris,
Editors, "New DNS RR Definitions", RFC 1183, Transarc,
University of Maryland, Prime Computer, USC/Information
Sciences Institute, October 1990.
[RFC1706] Manning, B., and R. Colella, "DNS NSAP Resource Records",
RFC 1706, USC/ISI and NIST, October 1994.
[RFC1712] Farrell, C., M. Schulze, B. Pleitner, and D. Baldoni, "DNS
Encoding of Geographical Location", RFC 1712, Curtin
University of Technology, October 1994.
[RFC1995] Ohta, M., "Incremental Zone Transfer in DNS", RFC 1995,
Tokyo Institute of Technology, August 1996.
[RFC1996] Vixie, P., "A Mechanism for Prompt Notification of Zone
Changes (DNS NOTIFY)", RFC 1996, ISC, August 1996.
[RFC2065] Eastlake, D., and C. Kaufman, "Domain Name System Security
Extensions", RFC 2065, CyberCash, Iris, January 1997.
[RFC2136] Vixie, P., S. Thomson, Y. Rekhter, and J. Bound, "Dynamic
Updates in the Domain Name System (DNS UPDATE) Dynamic
Updates in the Domain Name System (DNS UPDATE), RFC 2136,
ISC, Bellcore, Cisco, DEC, April 1997.
[RFC2163] Allocchio, C., "Using the Internet DNS to Distribute MIXER
Conformant Global Address Mapping (MCGAM)", RFC 2163,
GARR-Italy, July 1977.
[RFC2168] R. Danie1, M. Mealling., "Resolution of Uniform Resource
Identifiers using the Domain Name System", RFC 2168, Los
Alamos National Laboratory, Network Solutions, Inc.,
June 1997.
[RFC2230] Atkinson, R., "Key Exchange Delegation Record for the DNS",
RFC 2230, NRL, October 1997.
[RFC2535] Eastlake, D., "Domain Name System Security Extensions", RFC
2535, IBM, March 1999.
[RFC2538] Eastlake, D., Gudmundsson, O., "Storing Certificates in the
Domain Name System (DNS)", RFC 2538, IBM, TIS Labs, March 1999.
[RFC2671] Vixie, P., "Extension Mechanisms for DNS (EDNS0)", RFC 2671,
August 1999.
[RFC2782] Gulbrandsen, A., Vixie, P. and L. Esibov, "A DNS RR for
Specifying the Location of Services (DNS SRV)", RFC 2782,
February 2000.
[RFC2845] Vixie, P., Gudmundsson, O., Eastlake, D. and B. Wellington,
"Secret Key Transaction Authentication for DNS (TSIG)",
May 2000.
[RFC2874] Crawford, M., Huitema, C. and S. Thomson, "DNS Extensions to
Support IPv6 Address Aggregation and Renumbering", RFC 2874,
July 2000.
[RFC2915] Mealling, M. and R. Daniel, "The Naming Authority Pointer
(NAPTR) DNS Resource Record", RFC 2915, September 2000.
[RFC2929] D. Eastlake, 3rd, E. Brunner-Williams, and B. Manning,
"Domain Name System (DNS) IANA Considerations", RFC 2929,
September 2000.
[RFC2930] Eastlake, D., "Secret Key Establishment for DNS (TKEY RR)",
RFC 2930, September 2000.
[RFCXXXX] P. Koch, "A DNS RR Type for Lists of Address Prefixes (APL RR)",
RFC XXXX, Month Year.
PEOPLE
[Daniel] Ron Daniel, <rdaniel@lanl.gov>, June 1997.
[Dobrowski] George Dobrowski, <ghd@cc.bellcore.com>, July 1996.
[Eastlake] Donald E. Eastlake, III <dee3@torque.pothole.com>, January 1995,
November 1997.
[IANA] Internet Assigned Numbers Authority, <iana@iana.org>, December 1994.
[Mockapetris] Paul Mockapetris, <pvm@isi.edu>, November 1994.
[Otha] Masataka Ohta, <mohta@necom830.cc.titech.ac.jp>, March 1995.
[Patton] Michael Patton, <map@bbn.com>, June 1995.
[Thomson] Susan Thomson, <set@thumper.bellcore.com>, August 1995.
[Vixie] Paul Vixie, <paul@vix.com>, June 1997.
(last updated June 05 2001)
[]
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