Domain Name System (DNS) Parameters (last updated 2010-07-23) Registries included below: - DNS CLASSes - Resource Record (RR) TYPEs - DNS OpCodes - DNS RCODEs - AFSDB RR Subtype - DHCID RR Identifier Type Codes - DNS Label types - DNS EDNS0 Options - DNS Header Flags - EDNS Header Flags (16 bits) - EDNS Version Numbers (8 bits) Registry Name: DNS CLASSes Reference: [RFC 5395] Range Decimal Hexadecimal Registration Procedures Notes ----------- ------------- ----------------------------- ---------------------- 0 0x0000 Standards Action 1-127 0x0000-0x007F IETF Review data CLASSes only 128-253 0x0080-0x00FD IETF Review QCLASSes and meta-CLASSes only 256-32767 0x0100-0x7FFF IETF Review 32768-57343 0x8000-0xDFFF Specification Required data CLASSes only 57344-65279 0xE000-0xFEFF Specification Required QCLASSes and meta-CLASSes only 65280-65534 0xFF00-0xFFFE Reserved for Private Use 65535 0xFFFF Standards Action Registry: Decimal Hexadecimal Name Reference ----------- ----------- ------------------------------ --------- 0 0x0000 Reserved [RFC 5395] 1 0x0001 Internet (IN) [RFC 1035] 2 0x0002 Unassigned 3 0x0003 Chaos (CH) [Moon1981] 4 0x0004 Hesiod (HS) [Dyer1987] 5-253 0x0005-0x00FD Unassigned 254 0x00FD QCLASS NONE [RFC 2136] 255 0x00FF QCLASS * (ANY) [RFC 1035] 256-65279 0x0100-0xFEFF Unassigned 65280-65534 0xFF00-0xFFFE Reserved for Private Use [RFC 5395] 65535 0xFFFF Reserved [RFC 5395] Registry Name: Resource Record (RR) TYPEs Reference: [RFC 5395][RFC 1035] Range Decimal Hexadecimal Registration Procedures Notes ----------- ------------- -------------------------------------------------------------- -------------- 0 0x0000 RRTYPE zero is used as a special indicator for the SIG RR [RFC 2931], [RFC 4034] and in other circumstances and must never be allocated for ordinary use. 1-127 0x0000-0x007F DNS RRTYPE Allocation Policy data TYPEs 128-255 0x0080-0x00FF DNS RRTYPE Allocation Policy Q TYPEs, Meta TYPEs 256-61439 0x0100-0xEFFF DNS RRTYPE Allocation Policy data RRTYPEs 61440-65279 0xF000-0xFEFF IETF Review 65280-65534 0xFF00-0xFFFE Reserved for Private Use 65535 0xFFFF Reserved (Standards Action) Registry: TYPE Value and meaning Reference ----------- --------------------------------------------- --------- A 1 a host address [RFC 1035] NS 2 an authoritative name server [RFC 1035] MD 3 a mail destination (Obsolete - use MX) [RFC 1035] MF 4 a mail forwarder (Obsolete - use MX) [RFC 1035] CNAME 5 the canonical name for an alias [RFC 1035] SOA 6 marks the start of a zone of authority [RFC 1035] MB 7 a mailbox domain name (EXPERIMENTAL) [RFC 1035] MG 8 a mail group member (EXPERIMENTAL) [RFC 1035] MR 9 a mail rename domain name (EXPERIMENTAL) [RFC 1035] NULL 10 a null RR (EXPERIMENTAL) [RFC 1035] WKS 11 a well known service description [RFC 1035] PTR 12 a domain name pointer [RFC 1035] HINFO 13 host information [RFC 1035] MINFO 14 mailbox or mail list information [RFC 1035] MX 15 mail exchange [RFC 1035] TXT 16 text strings [RFC 1035] RP 17 for Responsible Person [RFC 1183] AFSDB 18 for AFS Data Base location [RFC 1183][RFC 5864] X25 19 for X.25 PSDN address [RFC 1183] ISDN 20 for ISDN address [RFC 1183] RT 21 for Route Through [RFC 1183] NSAP 22 for NSAP address, NSAP style A record [RFC 1706] NSAP-PTR 23 for domain name pointer, NSAP style [RFC 1348] SIG 24 for security signature [RFC 4034][RFC 3755][RFC 2535] KEY 25 for security key [RFC 4034][RFC 3755][RFC 2535] PX 26 X.400 mail mapping information [RFC 2163] GPOS 27 Geographical Position [RFC 1712] AAAA 28 IP6 Address [RFC 3596] LOC 29 Location Information [RFC 1876] NXT 30 Next Domain - OBSOLETE [RFC 3755][RFC 2535] EID 31 Endpoint Identifier [Patton] NIMLOC 32 Nimrod Locator [Patton] SRV 33 Server Selection [RFC 2782] ATMA 34 ATM Address [ATMDOC] NAPTR 35 Naming Authority Pointer [RFC 2915][RFC 2168][RFC 3403] KX 36 Key Exchanger [RFC 2230] CERT 37 CERT [RFC 4398] A6 38 A6 (Experimental) [RFC 3226][RFC 2874] DNAME 39 DNAME [RFC 2672] SINK 40 SINK [Eastlake] OPT 41 OPT [RFC 2671] APL 42 APL [RFC 3123] DS 43 Delegation Signer [RFC 4034][RFC 3658] SSHFP 44 SSH Key Fingerprint [RFC 4255] IPSECKEY 45 IPSECKEY [RFC 4025] RRSIG 46 RRSIG [RFC 4034][RFC 3755] NSEC 47 NSEC [RFC 4034][RFC 3755] DNSKEY 48 DNSKEY [RFC 4034][RFC 3755] DHCID 49 DHCID [RFC 4701] NSEC3 50 NSEC3 [RFC 5155] NSEC3PARAM 51 NSEC3PARAM [RFC 5155] Unassigned 52-54 HIP 55 Host Identity Protocol [RFC 5205] NINFO 56 NINFO [Reid] RKEY 57 RKEY [Reid] TALINK 58 Trust Anchor LINK [Wijngaards] Unassigned 59-98 SPF 99 [RFC 4408] UINFO 100 [IANA-Reserved] UID 101 [IANA-Reserved] GID 102 [IANA-Reserved] UNSPEC 103 [IANA-Reserved] Unassigned 104-248 TKEY 249 Transaction Key [RFC 2930] TSIG 250 Transaction Signature [RFC 2845] IXFR 251 incremental transfer [RFC 1995] AXFR 252 transfer of an entire zone [RFC 1035][RFC 5936] MAILB 253 mailbox-related RRs (MB, MG or MR) [RFC 1035] MAILA 254 mail agent RRs (Obsolete - see MX) [RFC 1035] * 255 A request for all records [RFC 1035] Unassigned 256-32767 TA 32768 DNSSEC Trust Authorities [Weiler] 2005-12-13 DLV 32769 DNSSEC Lookaside Validation [RFC 4431] Unassigned 32770-65279 Private use 65280-65534 Reserved 65535 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 Registry Name: DNS OpCodes Reference: [RFC 5395][RFC 1035] Registration Procedures: Standards Action as modified by [RFC 4020] Registry: OpCode Name Reference ------ --------------------------------- --------- 0 Query [RFC 1035] 1 IQuery (Inverse Query, Obsolete) [RFC 3425] 2 Status [RFC 1035] 3 Unassigned 4 Notify [RFC 1996] 5 Update [RFC 2136] 6-15 Unassigned Registry Name: DNS RCODEs Reference: [RFC 5395][RFC 1035] Registration Procedures: IETF Review Registry: RCODE Decimal Name Description Reference ----------- ---------- ----------------------------------- --------- 0 NoError No Error [RFC 1035] 1 FormErr Format Error [RFC 1035] 2 ServFail Server Failure [RFC 1035] 3 NXDomain Non-Existent Domain [RFC 1035] 4 NotImp Not Implemented [RFC 1035] 5 Refused Query Refused [RFC 1035] 6 YXDomain Name Exists when it should not [RFC 2136] 7 YXRRSet RR Set Exists when it should not [RFC 2136] 8 NXRRSet RR Set that should exist does not [RFC 2136] 9 NotAuth Server Not Authoritative for zone [RFC 2136] 10 NotZone Name not contained in zone [RFC 2136] 11-15 Unassigned 16 BADVERS Bad OPT Version [RFC 2671] 16 BADSIG TSIG Signature Failure [RFC 2845] 17 BADKEY Key not recognized [RFC 2845] 18 BADTIME Signature out of time window [RFC 2845] 19 BADMODE Bad TKEY Mode [RFC 2930] 20 BADNAME Duplicate key name [RFC 2930] 21 BADALG Algorithm not supported [RFC 2930] 22 BADTRUNC Bad Truncation [RFC 4635] 23-3840 Unassigned 3841-4095 Reserved for Private Use [RFC 5395] 4096-65534 Unassigned 65535 Reserved, can be allocated by Standards Action [RFC 5395] Registry Name: AFSDB RR Subtype Reference: [RFC 5395][RFC 1035] Range Decimal Hexadecimal Registration Procedures ----------- ------------- -------------------------------------- 0 0x0000 Standards Action 1-65279 0x0001-0xFEFF IETF Review 65280-65534 0xFF00-0xFFFE Private Use 65535 0xFFFF Standards Action Registry: Decimal Hexadecimal Description Reference ----------- ------------- ------------------------------------------ --------- 0 0x0000 Reserved [RFC 5395] 1 0x0001 Andrews File Service v3.0 Location Service [RFC 1183] 2 0x0002 DCE/NCA root cell directory node [RFC 1183] 3-65279 0x0003-0xFEFF Unassigned 65280-65534 0xFF00-0xFFFE Reserved for Private Use [RFC 5395] 65535 0xFFFF Reserved [RFC 5395] Registry Name: DHCID RR Identifier Type Codes Reference: [RFC 4701] Registration Procedures: Standards Action Note: Registration rules to be as follows: New DHCID RR type codes are tentatively assigned after the specification for the associated type code, published as an Internet Draft, has received expert review by a designated expert. The final assignment of DHCID RR type codes is through Standards Action, as defined in [RFC 2434]. The expert will be Olafur Gudmundsson Registry: Identifier Type Code Identifier Reference -------------------- ------------------------------------------------ --------- 0x0000 The 1-octet 'htype' followed by 'hlen' octets [RFC 4701] of 'chaddr' from a DHCPv4 client's DHCPREQUEST. 0x0001 The data octets (i.e., the Type and [RFC 4701] Client-Identifier fields) from a DHCPv4 client's Client Identifier option. 0x0002 The client's DUID (i.e., the data octets of a [RFC 4701] DHCPv6 client's Client Identifier option or the DUID field from a DHCPv4 client's Client Identifier option). 0x0003-0xFFFE Unassigned [RFC 4701] 0xFFFF Reserved [RFC 4701] Registry Name: DNS Label types Reference: [RFC 2671] Registration Procedures: IESG Approval Note: IETF standards action required to allocate new types The top 2 bits of the first byte of an DNS label indicates the type of label. Registry: Value Type Status Reference ---------------- --------------------------------------------------------- ---------------------------- ---------- 0 0 Normal label lower 6 bits is the length of the label Standard [RFC 1035] 1 1 Compressed label the lower 6 bits and the 8 bits Standard [RFC 1035] from next octet form a pointer to the compression target. 0 1 Extended label type the lower 6 bits of this type Proposed [RFC 2671] (section 3) indicate the type of label in use 0 1 0 0 0 0 0 1 Binary Label Experimental not recommended [RFC 3364][RFC 3363][RFC 2673] 0 1 1 1 1 1 1 1 Reserved for future expansion. Proposed [RFC 2671] 1 0 Unallocated Registry Name: DNS EDNS0 Options Reference: [RFC 2671] Registration Procedures: RFC Required Registry: Value Name Status Reference -------- ---------- ----------- ----------- 0 Reserved [RFC 2671] 1 LLQ On-hold [http://files.dns-sd.org/draft-sekar-dns-llq.txt] 2 UL On-hold [http://files.dns-sd.org/draft-sekar-dns-ul.txt] 3 NSID Standard [RFC 5001] 4 Reserved [draft-cheshire-edns0-owner-option] 5-65535 Unassigned [RFC 2671] Registry Name: DNS Header Flags Reference: [RFC 5395][RFC 1035] Registration Procedures: Standards Action Note: In DNS query header there is a flag field in the second 16 bit word in query from bit 5 through bit 11 ([RFC 1035] section 4.1.1) Registry: Bit Flag Description Reference -------- ---- --------------------- --------- bit 5 AA Authoritative Answer [RFC 1035] bit 6 TC Truncated Response [RFC 1035] bit 7 RD Recursion Desired [RFC 1035] bit 8 RA Recursion Allowed [RFC 1035] bit 9 Reserved bit 10 AD Authentic Data [RFC 4035] bit 11 CD Checking Disabled [RFC 4035] Registry Name: EDNS Header Flags (16 bits) Reference: [RFC 2671] Registration Procedures: RFC Required Registry: Bit Flag Description Reference --------- ---- --------------------- ------------------ Bit 0 DO DNSSEC answer OK [RFC 4035][RFC 3225] Bit 1-15 Reserved Registry Name: EDNS version Number (8 bits) Reference: [RFC 2671] Registration Procedures: Standards Action Registry: Range Description Reference -------- ----------------------- --------- 0 EDNS version 0 [RFC 2671] 1-255 Unassigned References ---------- [ATMDOC] ATM Forum Technical Committee, "ATM Name System, V2.0", Doc ID: AF-DANS-0152.000, July 2000. Available from http://broadband-forum.org/ftp/pub/approved-specs/af-saa-0069.000.pdf and held in escrow by IANA. [Dyer1987] Dyer, S., and F. Hsu, "Hesiod", Project Athena Technical Plan - Name Service, April 1987. [Moon1981] D. Moon, "Chaosnet", A.I. Memo 628, Massachusetts Institute of Technology Artificial Intelligence Laboratory, June 1981. [RFC 1034] Mockapetris, P., "Domain Names - Concepts and Facilities", STD 13, RFC 1034, USC/Information Sciences Institute, November 1987. [RFC 1035] Mockapetris, P., "Domain Names - Implementation and Specification", STD 13, RFC 1035, USC/Information Sciences Institute, November 1987. [RFC 1183] 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. [RFC 1706] Manning, B., and R. Colella, "DNS NSAP Resource Records", RFC 1706, USC/ISI and NIST, October 1994. [RFC 1712] Farrell, C., M. Schulze, B. Pleitner, and D. Baldoni, "DNS Encoding of Geographical Location", RFC 1712, Curtin University of Technology, October 1994. [RFC 1876] C. Davis, P. Vixie, T. Goodwin, and I. Dickinson, "A Means for Expressing Location Information in the Domain Name System", RFC 1876, January 1996. [RFC 1995] Ohta, M., "Incremental Zone Transfer in DNS", RFC 1995, Tokyo Institute of Technology, August 1996. [RFC 1996] Vixie, P., "A Mechanism for Prompt Notification of Zone Changes (DNS NOTIFY)", RFC 1996, ISC, August 1996. [RFC 2136] 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. [RFC 2163] Allocchio, C., "Using the Internet DNS to Distribute MIXER Conformant Global Address Mapping (MCGAM)", RFC 2163, GARR-Italy, July 1977. [RFC 2168] 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. [RFC 2230] Atkinson, R., "Key Exchange Delegation Record for the DNS", RFC 2230, NRL, October 1997. [RFC 2535] Eastlake, D., "Domain Name System Security Extensions", RFC 2535, IBM, March 1999. [RFC 2671] Vixie, P., "Extension Mechanisms for DNS (EDNS0)", RFC 2671, August 1999. [RFC 2782] Gulbrandsen, A., Vixie, P. and L. Esibov, "A DNS RR for Specifying the Location of Services (DNS SRV)", RFC 2782, February 2000. [RFC 2845] Vixie, P., Gudmundsson, O., Eastlake, D. and B. Wellington, "Secret Key Transaction Authentication for DNS (TSIG)", May 2000. [RFC 2874] Crawford, M., Huitema, C. and S. Thomson, "DNS Extensions to Support IPv6 Address Aggregation and Renumbering", RFC 2874, July 2000. [RFC 2915] Mealling, M. and R. Daniel, "The Naming Authority Pointer (NAPTR) DNS Resource Record", RFC 2915, September 2000. [RFC 2930] Eastlake, D., "Secret Key Establishment for DNS (TKEY RR)", RFC 2930, September 2000. [RFC 2931] D. Eastlake, "DNS Request and Transaction Signatures ( SIG(0)s )", RFC 2931, September 2000. [RFC 3123] P. Koch, "A DNS RR Type for Lists of Address Prefixes (APL RR)", RFC 3123, June 2001. [RFC 3225] D. Conrad, "Indicating Resolver Support of DNSSEC", RFC 3225, December 2001. [RFC 3226] O. Gudmundsson, "DNSSEC and IPv6 A6 aware server/resolver message size requirements", RFC 3226, December 2001. [RFC 3403] M. Mealling, "Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) Database", RFC 3403, October 2002. [RFC 3425] D. Lawrence, "Obsoleting IQUERY", RFC 3425, November 2002. [RFC 3596] S. Thomson, C. Huitema, V. Ksinant, and M. Souissi, "DNS Extensions to Support IP Version 6", RFC 3596, October 2003. [RFC 3658] O. Gudmundsson, "Delegation Signer Resource Record", RFC 3658, December 2003. [RFC 3755] S. Weiler, "Legacy Resolver Compatibility for Delegation Signer", RFC 3755, May 2004. [RFC 4020] K. Kompella, A. Zinin, "Early IANA Allocation of Standards Track Code Points", RFC 4020, February 2005. [RFC 4025] M. Richardson, "A Method for Storing IPsec Keying Material in DNS", RFC 4025, March 2005. [RFC 4034] R. Arends, R. Austein, M. Larson, D. Massey, and S. Rose, "Resource Records for the DNS Security Extensions", RFC 4034, March 2005. [RFC 4035] R. Arends, R. Austein, M. Larson, D. Massey, and S. Rose, "Protocol Modifications for the DNS Security Extensions", RFC 4035, March 2005. [RFC 4255] J. Schlyter and W. Griffin, "Using DNS to Securely Publish SSH Key Fingerprints", RFC 4255, January 2006. [RFC 4398] S. Josefsson, "Storing Certificates in the Domain Name System (DNS)", RFC 4398, March 2006. [RFC 4408] M. Wong and W. Schlitt, "Sender Policy Framework (SPF) for Authorizing Use of Domains in E-MAIL, version 1", RFC 4408, April 2006. [RFC 4431] M. Andrews and S. Weiler, "The DNSSEC Lookaside Validation (DLV) DNS Resource Record", RFC 4431, February 2006. [RFC 4635] D. Eastlake 3rd, "HMAC SHA TSIG Algorithm Identifiers", RFC 4635, August 2006. [RFC 4701] M. Stapp, T. Lemon, A. Gustafsson, "A DNS RR for Encoding DHCP Information (DHCID RR)", RFC 4701, October 2006. [RFC 5001] R. Austein, "DNS Name Server Identifier Option (NSID)", RFC 5001, August 2007. [RFC 5155] B. Laurie, G. Sisson, R. Arends, D. Blacka, "DNSSEC Hashed Authenticated Denial of Existence", RFC 5155, March 2008. [RFC 5205] P. Nikander, J. Laganier, "Host Identity Protocol (HIP) Domain Name System (DNS) Extensions", RFC 5205, April 2008. [RFC 5395] D. Eastlake, "Domain Name System (DNS) IANA Considerations", BCP 42, RFC 5395, November 2008. [draft-cheshire-edns0-owner-option] work in progress [RFC 5864] R. Allbery, "DNS SRV Resource Records for AFS", RFC 5864, April 2010. [RFC 5936] E. Lewis, A. Hoenes, Ed., "DNS Zone Transfer Protocol (AXFR)", RFC 5936, June 2010. People -------- [Daniel] Ron Daniel, <rdaniel&lanl.gov>, June 1997. [Eastlake] Donald E. Eastlake, III <d3e3e3&gmail.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. [Reid] Jim Reid, <jim&telnic.org>, 21 January 2008. [Thomson] Susan Thomson, <set&thumper.bellcore.com>, August 1995. [Vixie] Paul Vixie, <paul&vix.com>, June 1997. [Weiler] Sam Weiler, <weiler+iana&tislabs.com>, December 2005. Deploying DNSSEC Without a Signed Rott. Technical Report 1999-19, Information Networking Institute, Carnegie Mellon University, April 2004. http://cameo.library.cmu.edu/ http://www.watson.org/~weiler/INI1999-19.pdf [Wijngaards] Wouter Wijngaards, <wouter&nlnetlabs.nl>, 2010-02-17. []
Sunday, September 5, 2010
DNS Resource Record (RR) Types & DNS Parameters (IANA
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