{"dataset":{"id":"53b076a8-078f-48c9-b7d5-e78e34c05183","slug":"dns-parameters","name":"DNS parameters (IANA registry)","description":"Assigned Domain Name System (DNS) parameters from the IANA DNS Parameters registry: resource record (RR) TYPEs, RCODEs, CLASSes, and OpCodes, one document per assigned value with its meaning, references, and template or registration date where the registry lists them. Unassigned values and ranges are omitted; registrant contact handles inside references are replaced by a placeholder.","visibility":"public","version":138,"documentCount":137,"createdAt":"2026-10-04T19:44:22.000Z","updatedAt":"2026-10-05T00:37:18.000Z","publisher":"Koskamo","license":"IANA Domain Name System (DNS) Parameters registry (iana.org/assignments/dns-parameters); registry data reproduced verbatim with references","reviewedAt":"2026-10-05T00:37:32.000Z"},"total":137,"documents":[{"id":"5c9b56b9-e7e9-4883-a549-3d88cffbe2b7","title":"RR type Reserved (0)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:44:28.000Z","updatedAt":"2026-10-04T19:44:28.000Z","text":"DNS resource record (RR) type Reserved (value 0) in the IANA Domain Name System (DNS) Parameters registry (no meaning listed).\n\n- TYPE: Reserved\n- Value: 0\n- References: RFC 6895\n- Registration Date: 2021-03-08"},{"id":"1d11b1be-d3b3-4562-8b5f-55662cba03fc","title":"RR type A (1)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:44:35.000Z","updatedAt":"2026-10-04T19:44:35.000Z","text":"DNS resource record (RR) type A (value 1) in the IANA Domain Name System (DNS) Parameters registry: a host address.\n\n- TYPE: A\n- Value: 1\n- Meaning: a host address\n- References: RFC 1035"},{"id":"a7a89764-dcb4-4058-a3e8-11f4b0d474ab","title":"RR type NS (2)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:44:41.000Z","updatedAt":"2026-10-04T19:44:41.000Z","text":"DNS resource record (RR) type NS (value 2) in the IANA Domain Name System (DNS) Parameters registry: an authoritative name server.\n\n- TYPE: NS\n- Value: 2\n- Meaning: an authoritative name server\n- References: RFC 1035"},{"id":"79553b64-05c9-4634-9555-8db03bd20a9f","title":"RR type MD (3)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:44:48.000Z","updatedAt":"2026-10-04T19:44:48.000Z","text":"DNS resource record (RR) type MD (value 3) in the IANA Domain Name System (DNS) Parameters registry: a mail destination (OBSOLETE - use MX).\n\n- TYPE: MD\n- Value: 3\n- Meaning: a mail destination (OBSOLETE - use MX)\n- References: RFC 1035"},{"id":"9f24a5da-a52e-4e07-a0db-cb6886cd9c0a","title":"RR type MF (4)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:44:54.000Z","updatedAt":"2026-10-04T19:44:54.000Z","text":"DNS resource record (RR) type MF (value 4) in the IANA Domain Name System (DNS) Parameters registry: a mail forwarder (OBSOLETE - use MX).\n\n- TYPE: MF\n- Value: 4\n- Meaning: a mail forwarder (OBSOLETE - use MX)\n- References: RFC 1035"},{"id":"60294049-6e7c-4259-a19f-1f32518b1866","title":"RR type CNAME (5)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:01.000Z","updatedAt":"2026-10-04T19:45:01.000Z","text":"DNS resource record (RR) type CNAME (value 5) in the IANA Domain Name System (DNS) Parameters registry: the canonical name for an alias.\n\n- TYPE: CNAME\n- Value: 5\n- Meaning: the canonical name for an alias\n- References: RFC 1035"},{"id":"a2ff8248-2ef3-4d27-8dcb-4b2fac85d9cb","title":"RR type SOA (6)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:07.000Z","updatedAt":"2026-10-04T19:45:07.000Z","text":"DNS resource record (RR) type SOA (value 6) in the IANA Domain Name System (DNS) Parameters registry: marks the start of a zone of authority.\n\n- TYPE: SOA\n- Value: 6\n- Meaning: marks the start of a zone of authority\n- References: RFC 1035"},{"id":"237e1c6d-0a7f-499e-b7a9-73789571eddf","title":"RR type MB (7)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:13.000Z","updatedAt":"2026-10-04T19:45:13.000Z","text":"DNS resource record (RR) type MB (value 7) in the IANA Domain Name System (DNS) Parameters registry: a mailbox domain name (EXPERIMENTAL).\n\n- TYPE: MB\n- Value: 7\n- Meaning: a mailbox domain name (EXPERIMENTAL)\n- References: RFC 1035"},{"id":"748dbfb2-8479-4b9b-9da0-7cf9bc175dd9","title":"RR type MG (8)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:20.000Z","updatedAt":"2026-10-04T19:45:20.000Z","text":"DNS resource record (RR) type MG (value 8) in the IANA Domain Name System (DNS) Parameters registry: a mail group member (EXPERIMENTAL).\n\n- TYPE: MG\n- Value: 8\n- Meaning: a mail group member (EXPERIMENTAL)\n- References: RFC 1035"},{"id":"90a5d304-d53c-49c0-b485-dfb0dbe4330a","title":"RR type MR (9)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:27.000Z","updatedAt":"2026-10-04T19:45:27.000Z","text":"DNS resource record (RR) type MR (value 9) in the IANA Domain Name System (DNS) Parameters registry: a mail rename domain name (EXPERIMENTAL).\n\n- TYPE: MR\n- Value: 9\n- Meaning: a mail rename domain name (EXPERIMENTAL)\n- References: RFC 1035"},{"id":"e146a612-e8b2-47eb-8372-38ce971b08b9","title":"RR type NULL (10)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:33.000Z","updatedAt":"2026-10-04T19:45:33.000Z","text":"DNS resource record (RR) type NULL (value 10) in the IANA Domain Name System (DNS) Parameters registry: a null RR (EXPERIMENTAL).\n\n- TYPE: NULL\n- Value: 10\n- Meaning: a null RR (EXPERIMENTAL)\n- References: RFC 1035"},{"id":"b808aaa5-e3ce-4ca5-baec-114c18ad8292","title":"RR type WKS (11)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:39.000Z","updatedAt":"2026-10-04T19:45:40.000Z","text":"DNS resource record (RR) type WKS (value 11) in the IANA Domain Name System (DNS) Parameters registry: a well known service description.\n\n- TYPE: WKS\n- Value: 11\n- Meaning: a well known service description\n- References: RFC 1035"},{"id":"40c2b44a-6d58-4556-aec5-76847887b33b","title":"RR type PTR (12)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:46.000Z","updatedAt":"2026-10-04T19:45:46.000Z","text":"DNS resource record (RR) type PTR (value 12) in the IANA Domain Name System (DNS) Parameters registry: a domain name pointer.\n\n- TYPE: PTR\n- Value: 12\n- Meaning: a domain name pointer\n- References: RFC 1035"},{"id":"0d7621b7-c392-4d5a-9526-bbf617c8a174","title":"RR type HINFO (13)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:53.000Z","updatedAt":"2026-10-04T19:45:53.000Z","text":"DNS resource record (RR) type HINFO (value 13) in the IANA Domain Name System (DNS) Parameters registry: host information.\n\n- TYPE: HINFO\n- Value: 13\n- Meaning: host information\n- References: RFC 1035"},{"id":"1b44d863-8646-4806-956f-b3e86adb6357","title":"RR type MINFO (14)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:45:59.000Z","updatedAt":"2026-10-04T19:45:59.000Z","text":"DNS resource record (RR) type MINFO (value 14) in the IANA Domain Name System (DNS) Parameters registry: mailbox or mail list information.\n\n- TYPE: MINFO\n- Value: 14\n- Meaning: mailbox or mail list information\n- References: RFC 1035"},{"id":"8cd6b01f-491c-4553-ae9d-4d97ab1cd3db","title":"RR type MX (15)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:06.000Z","updatedAt":"2026-10-04T19:46:06.000Z","text":"DNS resource record (RR) type MX (value 15) in the IANA Domain Name System (DNS) Parameters registry: mail exchange.\n\n- TYPE: MX\n- Value: 15\n- Meaning: mail exchange\n- References: RFC 1035"},{"id":"30d7e30c-7e5b-4c09-b728-346964ce77a6","title":"RR type TXT (16)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:12.000Z","updatedAt":"2026-10-04T19:46:12.000Z","text":"DNS resource record (RR) type TXT (value 16) in the IANA Domain Name System (DNS) Parameters registry: text strings.\n\n- TYPE: TXT\n- Value: 16\n- Meaning: text strings\n- References: RFC 1035"},{"id":"5ba8d576-be20-4dad-84c1-b3b4857dce8a","title":"RR type RP (17)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:19.000Z","updatedAt":"2026-10-04T19:46:19.000Z","text":"DNS resource record (RR) type RP (value 17) in the IANA Domain Name System (DNS) Parameters registry: for Responsible Person.\n\n- TYPE: RP\n- Value: 17\n- Meaning: for Responsible Person\n- References: RFC 1183"},{"id":"dd6dc080-51e1-4669-aeb7-d323809293a7","title":"RR type AFSDB (18)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:25.000Z","updatedAt":"2026-10-04T19:46:25.000Z","text":"DNS resource record (RR) type AFSDB (value 18) in the IANA Domain Name System (DNS) Parameters registry: for AFS Data Base location.\n\n- TYPE: AFSDB\n- Value: 18\n- Meaning: for AFS Data Base location\n- References: RFC 1183; RFC 5864"},{"id":"e88213b2-5fc6-4fb4-ae9b-e483b265df76","title":"RR type X25 (19)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:32.000Z","updatedAt":"2026-10-04T19:46:32.000Z","text":"DNS resource record (RR) type X25 (value 19) in the IANA Domain Name System (DNS) Parameters registry: for X.25 PSDN address.\n\n- TYPE: X25\n- Value: 19\n- Meaning: for X.25 PSDN address\n- References: RFC 1183"},{"id":"e483e5ca-10d7-404b-8be9-6d8ab6f8e67c","title":"RR type ISDN (20)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:38.000Z","updatedAt":"2026-10-04T19:46:38.000Z","text":"DNS resource record (RR) type ISDN (value 20) in the IANA Domain Name System (DNS) Parameters registry: for ISDN address.\n\n- TYPE: ISDN\n- Value: 20\n- Meaning: for ISDN address\n- References: RFC 1183"},{"id":"ec20cce3-291a-4919-b19b-bcd4b93c1a44","title":"RR type RT (21)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:45.000Z","updatedAt":"2026-10-04T19:46:45.000Z","text":"DNS resource record (RR) type RT (value 21) in the IANA Domain Name System (DNS) Parameters registry: for Route Through.\n\n- TYPE: RT\n- Value: 21\n- Meaning: for Route Through\n- References: RFC 1183"},{"id":"c8c55f15-36f1-4441-a92a-6bebdfd27260","title":"RR type NSAP (22)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:51.000Z","updatedAt":"2026-10-04T19:46:51.000Z","text":"DNS resource record (RR) type NSAP (value 22) in the IANA Domain Name System (DNS) Parameters registry: for NSAP address, NSAP style A record (DEPRECATED).\n\n- TYPE: NSAP\n- Value: 22\n- Meaning: for NSAP address, NSAP style A record (DEPRECATED)\n- References: RFC 1706; Moving TPC.INT and NSAP.INT infrastructure domains to historic"},{"id":"dff7b3fb-5ad2-4eaf-8cc6-c2c294fe88e3","title":"RR type NSAP-PTR (23)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:46:58.000Z","updatedAt":"2026-10-04T19:46:58.000Z","text":"DNS resource record (RR) type NSAP-PTR (value 23) in the IANA Domain Name System (DNS) Parameters registry: for domain name pointer, NSAP style (DEPRECATED).\n\n- TYPE: NSAP-PTR\n- Value: 23\n- Meaning: for domain name pointer, NSAP style (DEPRECATED)\n- References: RFC 1706; Moving TPC.INT and NSAP.INT infrastructure domains to historic"},{"id":"0bd12767-1895-42ea-ab32-3366894f99f7","title":"RR type SIG (24)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:04.000Z","updatedAt":"2026-10-04T19:47:04.000Z","text":"DNS resource record (RR) type SIG (value 24) in the IANA Domain Name System (DNS) Parameters registry: for security signature.\n\n- TYPE: SIG\n- Value: 24\n- Meaning: for security signature\n- References: RFC 2536; RFC 2931; RFC 3110; RFC 4034"},{"id":"9fc548b5-2dd0-479e-aba5-4f16549b3669","title":"RR type KEY (25)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:10.000Z","updatedAt":"2026-10-04T19:47:11.000Z","text":"DNS resource record (RR) type KEY (value 25) in the IANA Domain Name System (DNS) Parameters registry: for security key.\n\n- TYPE: KEY\n- Value: 25\n- Meaning: for security key\n- References: RFC 2536; RFC 2539; RFC 3110; RFC 4034"},{"id":"3876a11c-75b9-4945-82ff-d37ae29f8b82","title":"RR type PX (26)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:17.000Z","updatedAt":"2026-10-04T19:47:17.000Z","text":"DNS resource record (RR) type PX (value 26) in the IANA Domain Name System (DNS) Parameters registry: X.400 mail mapping information.\n\n- TYPE: PX\n- Value: 26\n- Meaning: X.400 mail mapping information\n- References: RFC 2163"},{"id":"3e9ff979-9899-4a8c-afa9-b479f6e46003","title":"RR type GPOS (27)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:24.000Z","updatedAt":"2026-10-04T19:47:24.000Z","text":"DNS resource record (RR) type GPOS (value 27) in the IANA Domain Name System (DNS) Parameters registry: Geographical Position.\n\n- TYPE: GPOS\n- Value: 27\n- Meaning: Geographical Position\n- References: RFC 1712"},{"id":"82cf0dcf-b460-43b3-814e-38461eec6f03","title":"RR type AAAA (28)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:30.000Z","updatedAt":"2026-10-04T19:47:30.000Z","text":"DNS resource record (RR) type AAAA (value 28) in the IANA Domain Name System (DNS) Parameters registry: IP6 Address.\n\n- TYPE: AAAA\n- Value: 28\n- Meaning: IP6 Address\n- References: RFC 3596"},{"id":"1a71210f-77a3-4152-b87b-de7bb690c35a","title":"RR type LOC (29)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:37.000Z","updatedAt":"2026-10-04T19:47:37.000Z","text":"DNS resource record (RR) type LOC (value 29) in the IANA Domain Name System (DNS) Parameters registry: Location Information.\n\n- TYPE: LOC\n- Value: 29\n- Meaning: Location Information\n- References: RFC 1876"},{"id":"aecc5c43-a1cc-493c-927e-6e7f2c28497c","title":"RR type NXT (30)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:43.000Z","updatedAt":"2026-10-04T19:47:43.000Z","text":"DNS resource record (RR) type NXT (value 30) in the IANA Domain Name System (DNS) Parameters registry: Next Domain (OBSOLETE).\n\n- TYPE: NXT\n- Value: 30\n- Meaning: Next Domain (OBSOLETE)\n- References: RFC 2535; RFC 3755"},{"id":"974e484b-4ea5-4cf1-8bfa-20a7e6f25123","title":"RR type EID (31)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:50.000Z","updatedAt":"2026-10-04T19:47:50.000Z","text":"DNS resource record (RR) type EID (value 31) in the IANA Domain Name System (DNS) Parameters registry: Endpoint Identifier.\n\n- TYPE: EID\n- Value: 31\n- Meaning: Endpoint Identifier\n- References: registrant contact on file with IANA (name omitted); http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt\n- Registration Date: 1995-06"},{"id":"ab3754a2-c949-41f3-9f07-63a55b83b452","title":"RR type NIMLOC (32)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:47:56.000Z","updatedAt":"2026-10-04T19:47:56.000Z","text":"DNS resource record (RR) type NIMLOC (value 32) in the IANA Domain Name System (DNS) Parameters registry: Nimrod Locator.\n\n- TYPE: NIMLOC\n- Value: 32\n- Meaning: Nimrod Locator\n- References: [1]; registrant contact on file with IANA (name omitted); http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt\n- Registration Date: 1995-06"},{"id":"c9c55de3-81ec-408e-b7e4-6fc6a3ee6a7c","title":"RR type SRV (33)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:03.000Z","updatedAt":"2026-10-04T19:48:03.000Z","text":"DNS resource record (RR) type SRV (value 33) in the IANA Domain Name System (DNS) Parameters registry: Server Selection.\n\n- TYPE: SRV\n- Value: 33\n- Meaning: Server Selection\n- References: [1]; RFC 2782"},{"id":"a25e2a15-e498-47d5-a4d5-29d5015c99fa","title":"RR type ATMA (34)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:09.000Z","updatedAt":"2026-10-04T19:48:09.000Z","text":"DNS resource record (RR) type ATMA (value 34) in the IANA Domain Name System (DNS) Parameters registry: ATM Address.\n\n- TYPE: ATMA\n- Value: 34\n- Meaning: ATM Address\n- References: ATM Forum Technical Committee, \"ATM Name System, V2.0\", Doc ID: AF-DANS-0152.000, July 2000. Available from and held in escrow by IANA."},{"id":"0b7278ec-3baf-4fb0-86c2-2942c9449144","title":"RR type NAPTR (35)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:16.000Z","updatedAt":"2026-10-04T19:48:16.000Z","text":"DNS resource record (RR) type NAPTR (value 35) in the IANA Domain Name System (DNS) Parameters registry: Naming Authority Pointer.\n\n- TYPE: NAPTR\n- Value: 35\n- Meaning: Naming Authority Pointer\n- References: RFC 3403"},{"id":"8894cdfa-6089-4b16-bfa9-722b68cd824d","title":"RR type KX (36)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:22.000Z","updatedAt":"2026-10-04T19:48:22.000Z","text":"DNS resource record (RR) type KX (value 36) in the IANA Domain Name System (DNS) Parameters registry: Key Exchanger.\n\n- TYPE: KX\n- Value: 36\n- Meaning: Key Exchanger\n- References: RFC 2230"},{"id":"4d11d277-90f3-4c8c-909a-c615f60538b2","title":"RR type CERT (37)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:28.000Z","updatedAt":"2026-10-04T19:48:28.000Z","text":"DNS resource record (RR) type CERT (value 37) in the IANA Domain Name System (DNS) Parameters registry: CERT.\n\n- TYPE: CERT\n- Value: 37\n- Meaning: CERT\n- References: RFC 4398"},{"id":"b86371d2-a8b8-44ee-a0f4-9f19c072959f","title":"RR type A6 (38)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:35.000Z","updatedAt":"2026-10-04T19:48:35.000Z","text":"DNS resource record (RR) type A6 (value 38) in the IANA Domain Name System (DNS) Parameters registry: A6 (OBSOLETE - use AAAA).\n\n- TYPE: A6\n- Value: 38\n- Meaning: A6 (OBSOLETE - use AAAA)\n- References: RFC 2874; RFC 3226; RFC 6563"},{"id":"2fe4da8d-db84-4cf9-8340-ad6ddbb7fa0d","title":"RR type DNAME (39)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:41.000Z","updatedAt":"2026-10-04T19:48:41.000Z","text":"DNS resource record (RR) type DNAME (value 39) in the IANA Domain Name System (DNS) Parameters registry: DNAME.\n\n- TYPE: DNAME\n- Value: 39\n- Meaning: DNAME\n- References: RFC 6672"},{"id":"6c7b8b2b-1253-4d5b-991a-bff5f707e6e2","title":"RR type SINK (40)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:48.000Z","updatedAt":"2026-10-04T19:48:48.000Z","text":"DNS resource record (RR) type SINK (value 40) in the IANA Domain Name System (DNS) Parameters registry: SINK.\n\n- TYPE: SINK\n- Value: 40\n- Meaning: SINK\n- References: registrant contact on file with IANA (name omitted); draft-eastlake-kitchen-sink-02\n- Registration Date: 1997-11"},{"id":"64875b37-02b0-4921-ae5b-422c4a9f3f3b","title":"RR type OPT (41)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:48:54.000Z","updatedAt":"2026-10-04T19:48:54.000Z","text":"DNS resource record (RR) type OPT (value 41) in the IANA Domain Name System (DNS) Parameters registry: OPT.\n\n- TYPE: OPT\n- Value: 41\n- Meaning: OPT\n- References: RFC 3225; RFC 6891"},{"id":"fa32ce79-f482-475e-8347-fe4bd1ab40ea","title":"RR type APL (42)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:01.000Z","updatedAt":"2026-10-04T19:49:01.000Z","text":"DNS resource record (RR) type APL (value 42) in the IANA Domain Name System (DNS) Parameters registry: APL.\n\n- TYPE: APL\n- Value: 42\n- Meaning: APL\n- References: RFC 3123"},{"id":"987bbec7-5f78-45e6-bd74-c3f6b690ddad","title":"RR type DS (43)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:07.000Z","updatedAt":"2026-10-04T19:49:07.000Z","text":"DNS resource record (RR) type DS (value 43) in the IANA Domain Name System (DNS) Parameters registry: Delegation Signer.\n\n- TYPE: DS\n- Value: 43\n- Meaning: Delegation Signer\n- References: RFC 4034"},{"id":"6ffce484-ce17-4395-a6a7-fbb42dd57682","title":"RR type SSHFP (44)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:14.000Z","updatedAt":"2026-10-04T19:49:14.000Z","text":"DNS resource record (RR) type SSHFP (value 44) in the IANA Domain Name System (DNS) Parameters registry: SSH Key Fingerprint.\n\n- TYPE: SSHFP\n- Value: 44\n- Meaning: SSH Key Fingerprint\n- References: RFC 4255"},{"id":"7bfe123c-fb1b-4a11-b863-625dabbd682f","title":"RR type IPSECKEY (45)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:20.000Z","updatedAt":"2026-10-04T19:49:20.000Z","text":"DNS resource record (RR) type IPSECKEY (value 45) in the IANA Domain Name System (DNS) Parameters registry: IPSECKEY.\n\n- TYPE: IPSECKEY\n- Value: 45\n- Meaning: IPSECKEY\n- References: RFC 4025"},{"id":"6955ea9a-5cb5-4436-bb95-a0c38b4a4708","title":"RR type RRSIG (46)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:27.000Z","updatedAt":"2026-10-04T19:49:27.000Z","text":"DNS resource record (RR) type RRSIG (value 46) in the IANA Domain Name System (DNS) Parameters registry: RRSIG.\n\n- TYPE: RRSIG\n- Value: 46\n- Meaning: RRSIG\n- References: RFC 4034"},{"id":"1c6eb8b5-4163-489c-bca4-43e370082d98","title":"RR type NSEC (47)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:33.000Z","updatedAt":"2026-10-04T19:49:33.000Z","text":"DNS resource record (RR) type NSEC (value 47) in the IANA Domain Name System (DNS) Parameters registry: NSEC.\n\n- TYPE: NSEC\n- Value: 47\n- Meaning: NSEC\n- References: RFC 4034; RFC 9077"},{"id":"da43f43b-b4c9-45d1-912f-cdf97f237b76","title":"RR type DNSKEY (48)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:40.000Z","updatedAt":"2026-10-04T19:49:40.000Z","text":"DNS resource record (RR) type DNSKEY (value 48) in the IANA Domain Name System (DNS) Parameters registry: DNSKEY.\n\n- TYPE: DNSKEY\n- Value: 48\n- Meaning: DNSKEY\n- References: RFC 4034"},{"id":"745448e0-1514-41e2-ac99-e6b4e4dcf346","title":"RR type DHCID (49)","sourceUrl":"https://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4","version":1,"createdAt":"2026-10-04T19:49:46.000Z","updatedAt":"2026-10-04T19:49:46.000Z","text":"DNS resource record (RR) type DHCID (value 49) in the IANA Domain Name System (DNS) Parameters registry: DHCID.\n\n- TYPE: DHCID\n- Value: 49\n- Meaning: DHCID\n- References: RFC 4701"}]}