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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.

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Documents

Showing 73–96 of 137 documents

DocumentVersion

RR type ISDN (20)

DNS resource record (RR) type ISDN (value 20) in the IANA Domain Name System (DNS) Parameters registry: for ISDN address.

v1

RR type ISO (70)

DNS resource record (RR) type ISO (value 70) in the IANA Domain Name System (DNS) Parameters registry: Value coded per an ISO standard.

v1

RR type IXFR (251)

DNS resource record (RR) type IXFR (value 251) in the IANA Domain Name System (DNS) Parameters registry: incremental transfer.

v1

RR type KEY (25)

DNS resource record (RR) type KEY (value 25) in the IANA Domain Name System (DNS) Parameters registry: for security key.

v1

RR type KX (36)

DNS resource record (RR) type KX (value 36) in the IANA Domain Name System (DNS) Parameters registry: Key Exchanger.

v1

RR type L32 (105)

DNS resource record (RR) type L32 (value 105) in the IANA Domain Name System (DNS) Parameters registry (no meaning listed).

v1

RR type L64 (106)

DNS resource record (RR) type L64 (value 106) in the IANA Domain Name System (DNS) Parameters registry (no meaning listed).

v1

RR type LOC (29)

DNS resource record (RR) type LOC (value 29) in the IANA Domain Name System (DNS) Parameters registry: Location Information.

v1

RR type LP (107)

DNS resource record (RR) type LP (value 107) in the IANA Domain Name System (DNS) Parameters registry (no meaning listed).

v1

RR type MAILA (254)

DNS resource record (RR) type MAILA (value 254) in the IANA Domain Name System (DNS) Parameters registry: mail agent RRs (OBSOLETE - see MX).

v1

RR type MAILB (253)

DNS resource record (RR) type MAILB (value 253) in the IANA Domain Name System (DNS) Parameters registry: mailbox-related RRs (MB, MG or MR).

v1

RR type MB (7)

DNS resource record (RR) type MB (value 7) in the IANA Domain Name System (DNS) Parameters registry: a mailbox domain name (EXPERIMENTAL).

v1

RR type MD (3)

DNS resource record (RR) type MD (value 3) in the IANA Domain Name System (DNS) Parameters registry: a mail destination (OBSOLETE - use MX).

v1

RR type MF (4)

DNS resource record (RR) type MF (value 4) in the IANA Domain Name System (DNS) Parameters registry: a mail forwarder (OBSOLETE - use MX).

v1

RR type MG (8)

DNS resource record (RR) type MG (value 8) in the IANA Domain Name System (DNS) Parameters registry: a mail group member (EXPERIMENTAL).

v1

RR type MINFO (14)

DNS resource record (RR) type MINFO (value 14) in the IANA Domain Name System (DNS) Parameters registry: mailbox or mail list information.

v1

RR type MR (9)

DNS resource record (RR) type MR (value 9) in the IANA Domain Name System (DNS) Parameters registry: a mail rename domain name (EXPERIMENTAL).

v1

RR type MX (15)

DNS resource record (RR) type MX (value 15) in the IANA Domain Name System (DNS) Parameters registry: mail exchange.

v1

RR type NAPTR (35)

DNS resource record (RR) type NAPTR (value 35) in the IANA Domain Name System (DNS) Parameters registry: Naming Authority Pointer.

v1

RR type NID (104)

DNS resource record (RR) type NID (value 104) in the IANA Domain Name System (DNS) Parameters registry (no meaning listed).

v1

RR type NIMLOC (32)

DNS resource record (RR) type NIMLOC (value 32) in the IANA Domain Name System (DNS) Parameters registry: Nimrod Locator.

v1

RR type NINFO (56)

DNS resource record (RR) type NINFO (value 56) in the IANA Domain Name System (DNS) Parameters registry: NINFO.

v1

RR type NS (2)

DNS resource record (RR) type NS (value 2) in the IANA Domain Name System (DNS) Parameters registry: an authoritative name server.

v1

RR type NSAP (22)

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).

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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retrieve request
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Change history

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

  1. Published by Koskamo

    RR type EUI48 (108) · v1

  2. Published by Koskamo

    RR type SVCB (64) · v1

  3. Published by Koskamo

    OpCode DNS Stateful Operations (DSO) (6) · v1

  4. Published by Koskamo

    OpCode Update (5) · v1

  5. Published by Koskamo

    OpCode Notify (4) · v1

  6. Published by Koskamo

    OpCode Status (2) · v1

  7. Published by Koskamo

    OpCode IQuery (Inverse Query, OBSOLETE) (1) · v1

  8. Published by Koskamo

    OpCode Query (0) · v1

  9. Published by Koskamo

    CLASS Reserved (65535) · v1

  10. Published by Koskamo

    CLASS QCLASS * (ANY) (255) · v1