DNS parameters (IANA registry)

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.

Browse 137 documents Use with your agent

Documents

Showing 25–48 of 137 documents

Document	Version
RCODE NoError (0) DNS RCODE NoError (value 0) in the IANA Domain Name System (DNS) Parameters registry: No Error.	v1
RCODE NotAuth (9, RFC 2136) DNS RCODE NotAuth (value 9) in the IANA Domain Name System (DNS) Parameters registry: Server Not Authoritative for zone.	v1
RCODE NotAuth (9, RFC 8945) DNS RCODE NotAuth (value 9) in the IANA Domain Name System (DNS) Parameters registry: Not Authorized.	v1
RCODE NotImp (4) DNS RCODE NotImp (value 4) in the IANA Domain Name System (DNS) Parameters registry: Not Implemented.	v1
RCODE NotZone (10) DNS RCODE NotZone (value 10) in the IANA Domain Name System (DNS) Parameters registry: Name not contained in zone.	v1
RCODE NXDomain (3) DNS RCODE NXDomain (value 3) in the IANA Domain Name System (DNS) Parameters registry: Non-Existent Domain.	v1
RCODE NXRRSet (8) DNS RCODE NXRRSet (value 8) in the IANA Domain Name System (DNS) Parameters registry: RR Set that should exist does not.	v1
RCODE Refused (5) DNS RCODE Refused (value 5) in the IANA Domain Name System (DNS) Parameters registry: Query Refused.	v1
RCODE Reserved, can be allocated by Standards Action (65535) DNS RCODE Reserved, can be allocated by Standards Action (value 65535) in the IANA Domain Name System (DNS) Parameters registry (no description listed).	v1
RCODE ServFail (2) DNS RCODE ServFail (value 2) in the IANA Domain Name System (DNS) Parameters registry: Server Failure.	v1
RCODE YXDomain (6) DNS RCODE YXDomain (value 6) in the IANA Domain Name System (DNS) Parameters registry: Name Exists when it should not.	v1
RCODE YXRRSet (7) DNS RCODE YXRRSet (value 7) in the IANA Domain Name System (DNS) Parameters registry: RR Set Exists when it should not.	v1
RR type * (255) DNS resource record (RR) type * (value 255) in the IANA Domain Name System (DNS) Parameters registry: A request for some or all records the server has available.	v1
RR type A (1) DNS resource record (RR) type A (value 1) in the IANA Domain Name System (DNS) Parameters registry: a host address.	v1
RR type A6 (38) DNS resource record (RR) type A6 (value 38) in the IANA Domain Name System (DNS) Parameters registry: A6 (OBSOLETE - use AAAA).	v1
RR type AAAA (28) DNS resource record (RR) type AAAA (value 28) in the IANA Domain Name System (DNS) Parameters registry: IP6 Address.	v1
RR type AFSDB (18) DNS resource record (RR) type AFSDB (value 18) in the IANA Domain Name System (DNS) Parameters registry: for AFS Data Base location.	v1
RR type AMTRELAY (260) DNS resource record (RR) type AMTRELAY (value 260) in the IANA Domain Name System (DNS) Parameters registry: Automatic Multicast Tunneling Relay.	v1
RR type APL (42) DNS resource record (RR) type APL (value 42) in the IANA Domain Name System (DNS) Parameters registry: APL.	v1
RR type ATMA (34) DNS resource record (RR) type ATMA (value 34) in the IANA Domain Name System (DNS) Parameters registry: ATM Address.	v1
RR type AVC (258) DNS resource record (RR) type AVC (value 258) in the IANA Domain Name System (DNS) Parameters registry: Application Visibility and Control.	v1
RR type AXFR (252) DNS resource record (RR) type AXFR (value 252) in the IANA Domain Name System (DNS) Parameters registry: transfer of an entire zone.	v1
RR type BRID (68) DNS resource record (RR) type BRID (value 68) in the IANA Domain Name System (DNS) Parameters registry: UAS Broadcast Remote Identification.	v1
RR type CAA (257) DNS resource record (RR) type CAA (value 257) in the IANA Domain Name System (DNS) Parameters registry: Certification Authority Restriction.	v1

Source, review, and usage

Published on Koskamo by: Koskamo
Version: 138
Documents: 137 documents
Reviewed: 2026-10-05
Last approved change: 2026-10-05
Agent lookups: 0 in the last 90 days
Reuse: IANA Domain Name System (DNS) Parameters registry (iana.org/assignments/dns-parameters); registry data reproduced verbatim with references
Review status: Published by Koskamo; proposed revisions require Koskamo approval

Original sources are linked on each document. Owner approval records a publishing decision; it does not imply independent fact checking.

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Set up your agent Read documents as JSON

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retrieve request

curl --fail-with-body 'https://koskamo.com/api/v1/retrieve' -H 'Content-Type: application/json' --data-raw '{"query":"dns-parameters","dataset":"dns-parameters","top_k":3}'

Change history

Every change that reached this dataset. Proposals from contributors land only after Koskamo approves them.

Published by Koskamo2026-10-05
RR type EUI48 (108) · v1
Published by Koskamo2026-10-05
RR type SVCB (64) · v1
Published by Koskamo2026-10-04
OpCode DNS Stateful Operations (DSO) (6) · v1
Published by Koskamo2026-10-04
OpCode Update (5) · v1
Published by Koskamo2026-10-04
OpCode Notify (4) · v1
Published by Koskamo2026-10-04
OpCode Status (2) · v1
Published by Koskamo2026-10-04
OpCode IQuery (Inverse Query, OBSOLETE) (1) · v1
Published by Koskamo2026-10-04
OpCode Query (0) · v1
Published by Koskamo2026-10-04
CLASS Reserved (65535) · v1
Published by Koskamo2026-10-04
CLASS QCLASS * (ANY) (255) · v1