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IANA's List of Domain Name System (DNS) Parameters

- Last Updated - 2024-08-19 - Available Formats - XML HTML Plain text Registries included below - DNS CLASSes - Resource Record (RR) TYPEs - DNS OpCodes - DNS RCODEs - AFSDB RR Subtype - DHCID RR Identifier Type Codes - DHCID RR Digest Type Codes - DNS Label Types - DNS EDNS0 Option Codes (OPT) - DNS Header Flags - EDNS Header Flags (16 bits) - EDNS version Number (8 bits) - Child Synchronization (CSYNC) Flags - Underscored and Globally Scoped DNS Node Names - DSO Type Codes - Extended DNS Error Codes - ZONEMD Schemes - ZONEMD Hash Algorithms - DNS Server Cookie Methods - DNS-over-QUIC Error Codes - DNS Catalog Zones Properties - DNS Resolver Information Keys - ZONEVERSION TYPE Values DNS CLASSes - Expert(s) - Petr Špaček, Ladislav Lhotka - Reference - [RFC6895][RFC9108] - Note - As noted in [RFC6762], Multicast DNS can only carry DNS records with classes in the range 0-32767. Classes in the range 32768 to 65535 are incompatible with Multicast DNS.

Reserved0[ RFC6895]2021-03-08A1a host address[ RFC1035]NS2an authoritative name server[ RFC1035]MD3a mail destination (OBSOLETE - use MX)[ RFC1035]MF4a mail forwarder (OBSOLETE - use MX)[ RFC1035]CNAME5the canonical name for an alias[ RFC1035]SOA6marks the start of a zone of authority[ RFC1035]MB7a mailbox domain name (EXPERIMENTAL)[ RFC1035]MG8a mail group member (EXPERIMENTAL)[ RFC1035]MR9a mail rename domain name (EXPERIMENTAL)[ RFC1035]NULL10a null RR (EXPERIMENTAL)[ RFC1035]WKS11a well known service description[ RFC1035]PTR12a domain name pointer[ RFC1035]HINFO13host information[ RFC1035]MINFO14mailbox or mail list information[ RFC1035]MX15mail exchange[ RFC1035]TXT16text strings[ RFC1035]RP17for Responsible Person[ RFC1183]AFSDB18for AFS Data Base location[ RFC1183][ RFC5864]X2519for X.25 PSDN address[ RFC1183]ISDN20for ISDN address[ RFC1183]RT21for Route Through[ RFC1183]NSAP22for NSAP address, NSAP style A record (DEPRECATED)[ RFC1706][ Moving TPC.INT and NSAP.INT infrastructure domains to historic]NSAP-PTR23for domain name pointer, NSAP style (DEPRECATED)[ RFC1706][ Moving TPC.INT and NSAP.INT infrastructure domains to historic]SIG24for security signature[ RFC2536][ RFC2931][ RFC3110][ RFC4034]KEY25for security key[ RFC2536][ RFC2539][ RFC3110][ RFC4034]PX26X.400 mail mapping information[ RFC2163]GPOS27Geographical Position[ RFC1712]AAAA28IP6 Address[ RFC3596]LOC29Location Information[ RFC1876]NXT30Next Domain (OBSOLETE)[ RFC2535][ RFC3755]EID31Endpoint Identifier[ Michael_Patton][ http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt]1995-06NIMLOC32Nimrod Locator[ 1][ Michael_Patton][ http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt]1995-06SRV33Server Selection[ 1][ RFC2782]ATMA34ATM Address[ ATM Forum Technical Committee, "ATM Name System, V2.0", Doc ID: AF-DANS-0152.000, July 2000. ]NAPTR35Naming Authority Pointer[ RFC3403]KX36Key Exchanger[ RFC2230]CERT37CERT[ RFC4398]A638A6 (OBSOLETE - use AAAA)[ RFC2874][ RFC3226][ RFC6563]DNAME39DNAME[ RFC6672]SINK40SINK[ Donald_E_Eastlake][ draft-eastlake-kitchen-sink]1997-11OPT41OPT[ RFC3225][ RFC6891]APL42APL[ RFC3123]DS43Delegation Signer[ RFC4034]SSHFP44SSH Key Fingerprint[ RFC4255]IPSECKEY45IPSECKEY[ RFC4025]RRSIG46RRSIG[ RFC4034]NSEC47NSEC[ RFC4034][ RFC9077]DNSKEY48DNSKEY[ RFC4034]DHCID49DHCID[ RFC4701]NSEC350NSEC3[ RFC5155][ RFC9077]NSEC3PARAM51NSEC3PARAM[ RFC5155]TLSA52TLSA[ RFC6698]SMIMEA53S/MIME cert association[ RFC8162] SMIMEA/smimea-completed-template 2015-12-01Unassigned54HIP55Host Identity Protocol[ RFC8005]NINFO56NINFO[ Jim_Reid] NINFO/ninfo-completed-template 2008-01-21RKEY57RKEY[ Jim_Reid] RKEY/rkey-completed-template 2008-01-21TALINK58Trust Anchor LINK[ Wouter_Wijngaards] TALINK/talink-completed-template 2010-02-17CDS59Child DS[ RFC7344] CDS/cds-completed-template 2011-06-06CDNSKEY60DNSKEY(s) the Child wants reflected in DS[ RFC7344]2014-06-16OPENPGPKEY61OpenPGP Key[ RFC7929] OPENPGPKEY/openpgpkey-completed-template 2014-08-12CSYNC62Child-To-Parent Synchronization[ RFC7477]2015-01-27ZONEMD63Message Digest Over Zone Data[ RFC8976] ZONEMD/zonemd-completed-template 2018-12-12SVCB64General-purpose service binding[ RFC9460] SVCB/svcb-completed-template 2020-06-30HTTPS65SVCB-compatible type for use with HTTP[ RFC9460] HTTPS/https-completed-template 2020-06-30Unassigned66-98SPF99[ RFC7208]UINFO100[IANA-Reserved]UID101[IANA-Reserved]GID102[IANA-Reserved]UNSPEC103[IANA-Reserved]NID104[ RFC6742] ILNP/nid-completed-template L32105[ RFC6742] ILNP/l32-completed-template L64106[ RFC6742] ILNP/l64-completed-template LP107[ RFC6742] ILNP/lp-completed-template EUI48108an EUI-48 address[ RFC7043] EUI48/eui48-completed-template 2013-03-27EUI64109an EUI-64 address[ RFC7043] EUI64/eui64-completed-template 2013-03-27Unassigned110-127NXNAME128NXDOMAIN indicator for Compact Denial of Existence[ draft-ietf-dnsop-compact-denial-of-existence-04] NXNAME/nxname-completed-template 2024-07-18Unassigned129-248TKEY249Transaction Key[ RFC2930]TSIG250Transaction Signature[ RFC8945]IXFR251incremental transfer[ RFC1995]AXFR252transfer of an entire zone[ RFC1035][ RFC5936]MAILB253mailbox-related RRs (MB, MG or MR)[ RFC1035]MAILA254mail agent RRs (OBSOLETE - see MX)[ RFC1035]*255A request for some or all records the server has available[ RFC1035][ RFC6895][ RFC8482]URI256URI[ RFC7553] URI/uri-completed-template 2011-02-22CAA257Certification Authority Restriction[ RFC8659] CAA/caa-completed-template 2011-04-07AVC258Application Visibility and Control[ Wolfgang_Riedel] AVC/avc-completed-template 2016-02-26DOA259Digital Object Architecture[ draft-durand-doa-over-dns] DOA/doa-completed-template 2017-08-30AMTRELAY260Automatic Multicast Tunneling Relay[ RFC8777] AMTRELAY/amtrelay-completed-template 2019-02-06RESINFO261Resolver Information as Key/Value Pairs[ RFC9606] RESINFO/resinfo-completed-template 2023-11-02WALLET262Public wallet address[ Paul_Hoffman] WALLET/wallet-completed-template 2024-06-21CLA263BP Convergence Layer Adapter[ draft-johnson-dns-ipn-cla-07] CLA/cla-completed-template 2024-07-25IPN264BP Node Number[ draft-johnson-dns-ipn-cla-07] IPN/ipn-completed-template 2024-07-25Unassigned265-32767TA32768DNSSEC Trust Authorities[ Sam_Weiler][ Deploying DNSSEC Without a Signed Root. Technical Report 1999-19, Information Networking Institute, Carnegie Mellon University, April 2004.

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