Domain Name System (DNS) Parameters
- Last Updated
- 2024-08-19
- Available Formats
-
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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.
- Note
-
When this registry is modified, the YANG module [iana-dns-class-rr-type] must be updated as defined in [RFC9108].
- Available Formats
-
CSV
Decimal | Hex | Registration Procedures | Note |
---|---|---|---|
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 | Private Use | |
65535 | 0xFFFF | Standards Action |
Decimal | Hexadecimal | Name | Reference |
---|---|---|---|
0 | 0x0000 | Reserved | [RFC6895] |
1 | 0x0001 | Internet (IN) | [RFC1035] |
2 | 0x0002 | Unassigned | |
3 | 0x0003 | Chaos (CH) | [D. Moon, "Chaosnet", A.I. Memo 628, Massachusetts Institute of Technology Artificial Intelligence Laboratory, June 1981.] |
4 | 0x0004 | Hesiod (HS) | [Dyer, S., and F. Hsu, "Hesiod", Project Athena Technical Plan - Name Service, April 1987.] |
5-253 | 0x0005-0x00FD | Unassigned | |
254 | 0x00FE | QCLASS NONE | [RFC2136] |
255 | 0x00FF | QCLASS * (ANY) | [RFC1035] |
256-65279 | 0x0100-0xFEFF | Unassigned | |
65280-65534 | 0xFF00-0xFFFE | Reserved for Private Use | [RFC6895] |
65535 | 0xFFFF | Reserved | [RFC6895] |
Resource Record (RR) TYPEs
- Expert(s)
-
Roy Arends, Frederico AC Neves, Ólafur Guðmundsson, Ray Bellis
- Reference
- [RFC6895][RFC1035][RFC9108]
- Note
-
When this registry is modified, the YANG module [iana-dns-class-rr-type] must be updated as defined in [RFC9108].
- Available Formats
-
CSV
Decimal | Hex | Registration Procedures | Note |
---|---|---|---|
0 | 0x0000 | RRTYPE zero is used as a special indicator for the SIG RR [RFC2931], [RFC4034] and in other circumstances and must never be allocated for ordinary use. | |
1-127 | 0x0000-0x007F | Expert Review (see mailing list information in [RFC6895]) or Standards Action | data TYPEs |
128-255 | 0x0080-0x00FF | Expert Review (see mailing list information in [RFC6895]) or Standards Action | Q TYPEs, Meta TYPEs |
256-61439 | 0x0100-0xEFFF | Expert Review (see mailing list information in [RFC6895]) or Standards Action | data RRTYPEs |
61440-65279 | 0xF000-0xFEFF | Reserved for future use (IETF Review required to define use) | |
65280-65534 | 0xFF00-0xFFFE | Private Use | |
65535 | 0xFFFF | Reserved (Standards Action) |
TYPE | Value | Meaning | Reference | Template | Registration Date |
---|---|---|---|---|---|
Reserved | 0 | [RFC6895] | 2021-03-08 | ||
A | 1 | a host address | [RFC1035] | ||
NS | 2 | an authoritative name server | [RFC1035] | ||
MD | 3 | a mail destination (OBSOLETE - use MX) | [RFC1035] | ||
MF | 4 | a mail forwarder (OBSOLETE - use MX) | [RFC1035] | ||
CNAME | 5 | the canonical name for an alias | [RFC1035] | ||
SOA | 6 | marks the start of a zone of authority | [RFC1035] | ||
MB | 7 | a mailbox domain name (EXPERIMENTAL) | [RFC1035] | ||
MG | 8 | a mail group member (EXPERIMENTAL) | [RFC1035] | ||
MR | 9 | a mail rename domain name (EXPERIMENTAL) | [RFC1035] | ||
NULL | 10 | a null RR (EXPERIMENTAL) | [RFC1035] | ||
WKS | 11 | a well known service description | [RFC1035] | ||
PTR | 12 | a domain name pointer | [RFC1035] | ||
HINFO | 13 | host information | [RFC1035] | ||
MINFO | 14 | mailbox or mail list information | [RFC1035] | ||
MX | 15 | mail exchange | [RFC1035] | ||
TXT | 16 | text strings | [RFC1035] | ||
RP | 17 | for Responsible Person | [RFC1183] | ||
AFSDB | 18 | for AFS Data Base location | [RFC1183][RFC5864] | ||
X25 | 19 | for X.25 PSDN address | [RFC1183] | ||
ISDN | 20 | for ISDN address | [RFC1183] | ||
RT | 21 | for Route Through | [RFC1183] | ||
NSAP | 22 | for NSAP address, NSAP style A record (DEPRECATED) | [RFC1706][Moving TPC.INT and NSAP.INT infrastructure domains to historic] | ||
NSAP-PTR | 23 | for domain name pointer, NSAP style (DEPRECATED) | [RFC1706][Moving TPC.INT and NSAP.INT infrastructure domains to historic] | ||
SIG | 24 | for security signature | [RFC2536][RFC2931][RFC3110][RFC4034] | ||
KEY | 25 | for security key | [RFC2536][RFC2539][RFC3110][RFC4034] | ||
PX | 26 | X.400 mail mapping information | [RFC2163] | ||
GPOS | 27 | Geographical Position | [RFC1712] | ||
AAAA | 28 | IP6 Address | [RFC3596] | ||
LOC | 29 | Location Information | [RFC1876] | ||
NXT | 30 | Next Domain (OBSOLETE) | [RFC2535][RFC3755] | ||
EID | 31 | Endpoint Identifier | [Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt] | 1995-06 | |
NIMLOC | 32 | Nimrod Locator | [1][Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt] | 1995-06 | |
SRV | 33 | Server Selection | [1][RFC2782] | ||
ATMA | 34 | ATM Address | [ 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.] | ||
NAPTR | 35 | Naming Authority Pointer | [RFC3403] | ||
KX | 36 | Key Exchanger | [RFC2230] | ||
CERT | 37 | CERT | [RFC4398] | ||
A6 | 38 | A6 (OBSOLETE - use AAAA) | [RFC2874][RFC3226][RFC6563] | ||
DNAME | 39 | DNAME | [RFC6672] | ||
SINK | 40 | SINK | [Donald_E_Eastlake][draft-eastlake-kitchen-sink] | 1997-11 | |
OPT | 41 | OPT | [RFC3225][RFC6891] | ||
APL | 42 | APL | [RFC3123] | ||
DS | 43 | Delegation Signer | [RFC4034] | ||
SSHFP | 44 | SSH Key Fingerprint | [RFC4255] | ||
IPSECKEY | 45 | IPSECKEY | [RFC4025] | ||
RRSIG | 46 | RRSIG | [RFC4034] | ||
NSEC | 47 | NSEC | [RFC4034][RFC9077] | ||
DNSKEY | 48 | DNSKEY | [RFC4034] | ||
DHCID | 49 | DHCID | [RFC4701] | ||
NSEC3 | 50 | NSEC3 | [RFC5155][RFC9077] | ||
NSEC3PARAM | 51 | NSEC3PARAM | [RFC5155] | ||
TLSA | 52 | TLSA | [RFC6698] | ||
SMIMEA | 53 | S/MIME cert association | [RFC8162] | SMIMEA/smimea-completed-template | 2015-12-01 |
Unassigned | 54 | ||||
HIP | 55 | Host Identity Protocol | [RFC8005] | ||
NINFO | 56 | NINFO | [Jim_Reid] | NINFO/ninfo-completed-template | 2008-01-21 |
RKEY | 57 | RKEY | [Jim_Reid] | RKEY/rkey-completed-template | 2008-01-21 |
TALINK | 58 | Trust Anchor LINK | [Wouter_Wijngaards] | TALINK/talink-completed-template | 2010-02-17 |
CDS | 59 | Child DS | [RFC7344] | CDS/cds-completed-template | 2011-06-06 |
CDNSKEY | 60 | DNSKEY(s) the Child wants reflected in DS | [RFC7344] | 2014-06-16 | |
OPENPGPKEY | 61 | OpenPGP Key | [RFC7929] | OPENPGPKEY/openpgpkey-completed-template | 2014-08-12 |
CSYNC | 62 | Child-To-Parent Synchronization | [RFC7477] | 2015-01-27 | |
ZONEMD | 63 | Message Digest Over Zone Data | [RFC8976] | ZONEMD/zonemd-completed-template | 2018-12-12 |
SVCB | 64 | General-purpose service binding | [RFC9460] | SVCB/svcb-completed-template | 2020-06-30 |
HTTPS | 65 | SVCB-compatible type for use with HTTP | [RFC9460] | HTTPS/https-completed-template | 2020-06-30 |
Unassigned | 66-98 | ||||
SPF | 99 | [RFC7208] | |||
UINFO | 100 | [IANA-Reserved] | |||
UID | 101 | [IANA-Reserved] | |||
GID | 102 | [IANA-Reserved] | |||
UNSPEC | 103 | [IANA-Reserved] | |||
NID | 104 | [RFC6742] | ILNP/nid-completed-template | ||
L32 | 105 | [RFC6742] | ILNP/l32-completed-template | ||
L64 | 106 | [RFC6742] | ILNP/l64-completed-template | ||
LP | 107 | [RFC6742] | ILNP/lp-completed-template | ||
EUI48 | 108 | an EUI-48 address | [RFC7043] | EUI48/eui48-completed-template | 2013-03-27 |
EUI64 | 109 | an EUI-64 address | [RFC7043] | EUI64/eui64-completed-template | 2013-03-27 |
Unassigned | 110-127 | ||||
NXNAME | 128 | NXDOMAIN indicator for Compact Denial of Existence | [draft-ietf-dnsop-compact-denial-of-existence-04] | NXNAME/nxname-completed-template | 2024-07-18 |
Unassigned | 129-248 | ||||
TKEY | 249 | Transaction Key | [RFC2930] | ||
TSIG | 250 | Transaction Signature | [RFC8945] | ||
IXFR | 251 | incremental transfer | [RFC1995] | ||
AXFR | 252 | transfer of an entire zone | [RFC1035][RFC5936] | ||
MAILB | 253 | mailbox-related RRs (MB, MG or MR) | [RFC1035] | ||
MAILA | 254 | mail agent RRs (OBSOLETE - see MX) | [RFC1035] | ||
* | 255 | A request for some or all records the server has available | [RFC1035][RFC6895][RFC8482] | ||
URI | 256 | URI | [RFC7553] | URI/uri-completed-template | 2011-02-22 |
CAA | 257 | Certification Authority Restriction | [RFC8659] | CAA/caa-completed-template | 2011-04-07 |
AVC | 258 | Application Visibility and Control | [Wolfgang_Riedel] | AVC/avc-completed-template | 2016-02-26 |
DOA | 259 | Digital Object Architecture | [draft-durand-doa-over-dns] | DOA/doa-completed-template | 2017-08-30 |
AMTRELAY | 260 | Automatic Multicast Tunneling Relay | [RFC8777] | AMTRELAY/amtrelay-completed-template | 2019-02-06 |
RESINFO | 261 | Resolver Information as Key/Value Pairs | [RFC9606] | RESINFO/resinfo-completed-template | 2023-11-02 |
WALLET | 262 | Public wallet address | [Paul_Hoffman] | WALLET/wallet-completed-template | 2024-06-21 |
CLA | 263 | BP Convergence Layer Adapter | [draft-johnson-dns-ipn-cla-07] | CLA/cla-completed-template | 2024-07-25 |
IPN | 264 | BP Node Number | [draft-johnson-dns-ipn-cla-07] | IPN/ipn-completed-template | 2024-07-25 |
Unassigned | 265-32767 | ||||
TA | 32768 | DNSSEC Trust Authorities | [Sam_Weiler][ Deploying DNSSEC Without a Signed Root. Technical Report 1999-19, Information Networking Institute, Carnegie Mellon University, April 2004.] | 2005-12-13 | |
DLV | 32769 | DNSSEC Lookaside Validation (OBSOLETE) | [RFC8749][RFC4431] | ||
Unassigned | 32770-65279 | ||||
Private use | 65280-65534 | ||||
Reserved | 65535 |
DNS OpCodes
- Registration Procedure(s)
-
Standards Action
- Reference
- [RFC6895][RFC1035]
- Available Formats
-
CSV
OpCode | Name | Reference |
---|---|---|
0 | Query | [RFC1035] |
1 | IQuery (Inverse Query, OBSOLETE) | [RFC3425] |
2 | Status | [RFC1035] |
3 | Unassigned | |
4 | Notify | [RFC1996] |
5 | Update | [RFC2136] |
6 | DNS Stateful Operations (DSO) | [RFC8490] |
7-15 | Unassigned |
DNS RCODEs
- Reference
- [RFC6895][RFC1035]
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
0-3840 | IETF Review |
3841-4095 | Private Use |
4096-65534 | IETF Review |
65535 | Reserved (Standards Action) |
RCODE | Name | Description | Reference |
---|---|---|---|
0 | NoError | No Error | [RFC1035] |
1 | FormErr | Format Error | [RFC1035] |
2 | ServFail | Server Failure | [RFC1035] |
3 | NXDomain | Non-Existent Domain | [RFC1035] |
4 | NotImp | Not Implemented | [RFC1035] |
5 | Refused | Query Refused | [RFC1035] |
6 | YXDomain | Name Exists when it should not | [RFC2136][RFC6672] |
7 | YXRRSet | RR Set Exists when it should not | [RFC2136] |
8 | NXRRSet | RR Set that should exist does not | [RFC2136] |
9 | NotAuth | Server Not Authoritative for zone | [RFC2136] |
9 | NotAuth | Not Authorized | [RFC8945] |
10 | NotZone | Name not contained in zone | [RFC2136] |
11 | DSOTYPENI | DSO-TYPE Not Implemented | [RFC8490] |
12-15 | Unassigned | ||
16 | BADVERS | Bad OPT Version | [RFC6891] |
16 | BADSIG | TSIG Signature Failure | [RFC8945] |
17 | BADKEY | Key not recognized | [RFC8945] |
18 | BADTIME | Signature out of time window | [RFC8945] |
19 | BADMODE | Bad TKEY Mode | [RFC2930] |
20 | BADNAME | Duplicate key name | [RFC2930] |
21 | BADALG | Algorithm not supported | [RFC2930] |
22 | BADTRUNC | Bad Truncation | [RFC8945] |
23 | BADCOOKIE | Bad/missing Server Cookie | [RFC7873] |
24-3840 | Unassigned | ||
3841-4095 | Reserved for Private Use | [RFC6895] | |
4096-65534 | Unassigned | ||
65535 | Reserved, can be allocated by Standards Action | [RFC6895] |
AFSDB RR Subtype
- Registration Procedure(s)
-
Registry closed per [RFC6895]
- Reference
- [RFC6895][RFC1035]
- Available Formats
-
CSV
Decimal | Hexadecimal | Description | Reference |
---|---|---|---|
0 | 0x0000 | Reserved; registry closed | [RFC6895] |
1 | 0x0001 | Andrews File Service v3.0 Location Service | [RFC1183] |
2 | 0x0002 | DCE/NCA root cell directory node | [RFC1183] |
3-65279 | 0x0003-0xFEFF | Not allocated; registry closed | |
65280-65534 | 0xFF00-0xFFFE | Reserved for Private Use | [RFC6895] |
65535 | 0xFFFF | Reserved; registry closed | [RFC6895] |
DHCID RR Identifier Type Codes
- Registration Procedure(s)
-
Standards Action
- Expert(s)
-
Ólafur Guðmundsson
- Reference
- [RFC4701]
- 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 [RFC2434].
- Available Formats
-
CSV
Identifier Type Code | Identifier | Reference |
---|---|---|
0x0000 | The 1-octet 'htype' followed by 'hlen' octets of 'chaddr' from a DHCPv4 client's DHCPREQUEST. | [RFC4701] |
0x0001 | The data octets (i.e., the Type and Client-Identifier fields) from a DHCPv4 client's Client Identifier option. | [RFC4701] |
0x0002 | The client's DUID (i.e., the data octets of a DHCPv6 client's Client Identifier option or the DUID field from a DHCPv4 client's Client Identifier option). | [RFC4701] |
0x0003-0xFFFE | Unassigned | [RFC4701] |
0xFFFF | Reserved | [RFC4701] |
DHCID RR Digest Type Codes
- Registration Procedure(s)
-
Standards Action
- Reference
- [RFC4701]
- Available Formats
-
CSV
Digest Type Code | Description | Reference |
---|---|---|
0 | Reserved | [RFC4701] |
1 | SHA-256 | [RFC4701] |
2-255 | Unassigned |
DNS Label Types
- Registration Procedure(s)
-
Standards Action
- Reference
- [RFC6891]
- Note
-
The top 2 bits of the first byte of an DNS label indicate the type of label.
- Available Formats
-
CSV
Value | Type | Status | Reference |
---|---|---|---|
0 0 | Normal label lower 6 bits is the length of the label | Standard | [RFC1035] |
1 1 | Compressed label the lower 6 bits and the 8 bits from next octet form a pointer to the compression target. | Standard | [RFC1035] |
0 1 | Extended label type the lower 6 bits of this type (section 3) indicate the type of label in use | Proposed | [RFC6891] |
0 1 0 0 0 0 0 1 | Binary Label | Historic | [RFC3364][RFC3363][RFC2673][RFC6891] |
0 1 1 1 1 1 1 1 | Reserved for future expansion. | Proposed | [RFC6891] |
1 0 | Unallocated |
DNS EDNS0 Option Codes (OPT)
- Expert(s)
-
Ólafur Guðmundsson (primary), Frederico AC Neves (secondary), Ray Bellis (secondary), Roy Arends (secondary)
- Reference
- [RFC6891][RFC Errata 3604]
- Note
-
Registrations made by standards-track documents are listed as "Standard," and by non-standards-track documents as "Optional." Registrations for which there are no final specifications are listed as "On-Hold."
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
1-65000 | Expert Review |
65001-65534 | Local/Experimental Use |
Value | Name | Status | Reference |
---|---|---|---|
0 | Reserved | [RFC6891] | |
1 | LLQ | Optional | [RFC8764] |
2 | Update Lease | Standard | [RFC-ietf-dnssd-update-lease-08] |
3 | NSID | Standard | [RFC5001] |
4 | Reserved | [draft-cheshire-edns0-owner-option] | |
5 | DAU | Standard | [RFC6975] |
6 | DHU | Standard | [RFC6975] |
7 | N3U | Standard | [RFC6975] |
8 | edns-client-subnet | Optional | [RFC7871] |
9 | EDNS EXPIRE | Optional | [RFC7314] |
10 | COOKIE | Standard | [RFC7873] |
11 | edns-tcp-keepalive | Standard | [RFC7828] |
12 | Padding | Standard | [RFC7830] |
13 | CHAIN | Standard | [RFC7901] |
14 | edns-key-tag | Optional | [RFC8145] |
15 | Extended DNS Error | Standard | [RFC8914] |
16 | EDNS-Client-Tag | Optional | [draft-bellis-dnsop-edns-tags] |
17 | EDNS-Server-Tag | Optional | [draft-bellis-dnsop-edns-tags] |
18 | Report-Channel | Standard | [RFC9567] |
19 | ZONEVERSION | Standard | [RFC-ietf-dnsop-zoneversion-11] |
20-20291 | Unassigned | ||
20292 | Umbrella Ident | Optional | [https://developer.cisco.com/docs/cloud-security/#!integrating-network-devices/rdata-description][Cisco_CIE_DNS_team] |
20293-26945 | Unassigned | ||
26946 | DeviceID | Optional | [https://developer.cisco.com/docs/cloud-security/#!network-devices-getting-started/response-codes][Cisco_CIE_DNS_team] |
26947-65000 | Unassigned | ||
65001-65534 | Reserved for Local/Experimental Use | [RFC6891] | |
65535 | Reserved for future expansion | [RFC6891] |
DNS Header Flags
- Registration Procedure(s)
-
Standards Action
- Reference
- [RFC6895][RFC1035]
- Note
-
In DNS query header there is a flag field in the second 16 bit word in query from bit 5 through bit 11 ([RFC1035] section 4.1.1)
- Available Formats
-
CSV
Bit | Flag | Description | Reference |
---|---|---|---|
bit 5 | AA | Authoritative Answer | [RFC1035] |
bit 6 | TC | Truncated Response | [RFC1035] |
bit 7 | RD | Recursion Desired | [RFC1035] |
bit 8 | RA | Recursion Available | [RFC1035] |
bit 9 | Reserved | ||
bit 10 | AD | Authentic Data | [RFC4035][RFC6840][RFC Errata 4924] |
bit 11 | CD | Checking Disabled | [RFC4035][RFC6840][RFC Errata 4927] |
EDNS Header Flags (16 bits)
- Registration Procedure(s)
-
Standards Action
- Reference
- [RFC6891]
- Available Formats
-
CSV
Bit | Flag | Description | Reference |
---|---|---|---|
Bit 0 | DO | DNSSEC answer OK | [RFC4035][RFC3225][RFC6840][RFC Errata 4928] |
Bit 1-15 | Reserved |
EDNS version Number (8 bits)
- Registration Procedure(s)
-
Standards Action
- Reference
- [RFC6891]
- Available Formats
-
CSV
Range | Description | Reference |
---|---|---|
0 | EDNS version 0 | [RFC6891] |
1-255 | Unassigned |
Child Synchronization (CSYNC) Flags
- Registration Procedure(s)
-
Standards Action
- Reference
- [RFC7477]
- Available Formats
-
CSV
Bit | Flag | Description | Reference |
---|---|---|---|
0 | immediate | Immediately process this CSYNC record. | [RFC7477, Section 3] |
1 | soaminimum | Require a SOA serial number greater than the one specified. | [RFC7477, Section 2.1.1.1] |
2-15 | Unassigned |
Underscored and Globally Scoped DNS Node Names
- Registration Procedure(s)
-
Expert Review
- Expert(s)
-
Frederico A C Neves, Paul Wouters
- Reference
- [RFC8552]
- Available Formats
-
CSV
RR Type | _NODE NAME | Reference |
---|---|---|
* | _example | [RFC8552, Section 4.1.4] |
HTTPS | _https | [RFC9460] |
NULL | _ta-* [2] | [RFC8145] |
OPENPGPKEY | _openpgpkey | [RFC7929] |
SMIMEA | _smimecert | [RFC8162] |
SRV | _dccp | [RFC2782] |
SRV | _http | [RFC4386] |
SRV | _ipv6 | [RFC5026] |
SRV | _ldap | [RFC4386] |
SRV | _ocsp | [RFC4386] |
SRV | _sctp | [RFC2782] |
SRV | _sip | [RFC5509] |
SRV | _tcp | [RFC2782] |
SRV | _udp | [RFC2782] |
SRV | _xmpp | [RFC3921] |
SVCB | _dns | [RFC9461] |
TLSA | _dane | [RFC7671] |
TLSA | _sctp | [RFC6698] |
TLSA | _tcp | [RFC6698] |
TLSA | _udp | [RFC6698] |
TXT | _acme-challenge | [RFC8555] |
TXT | _dmarc | [RFC7489] |
TXT | _domainkey | [RFC6376] |
TXT | _er | [RFC9567] |
TXT | _mta-sts | [RFC8461] |
TXT | _spf | [RFC7208] |
TXT | _splitdns-challenge | [RFC-ietf-add-split-horizon-authority-14] |
TXT | _sztp | [RFC8572] |
TXT | _tcp | [RFC6763] |
TXT | _udp | [RFC6763] |
TXT | _validation-contactemail | [https://cabforum.org/wp-content/uploads/CA-Browser-Forum-BR-1.7.4.pdf] |
TXT | _validation-contactphone | [https://cabforum.org/wp-content/uploads/CA-Browser-Forum-BR-1.7.4.pdf] |
TXT | _vouch | [RFC5518] |
URI | _acct | [RFC7566][RFC Errata 7064] |
URI | _dccp | [RFC4340][RFC Errata 7066] |
URI | _email | [RFC6118] |
URI | _ems | [RFC6118] |
URI | _fax | [RFC6118] |
URI | _ft | [RFC6118] |
URI | _h323 | [RFC6118] |
URI | _iax | [RFC6315][RFC Errata 7065] |
URI | _ical-access | [RFC6118] |
URI | _ical-sched | [RFC6118] |
URI | _ifax | [RFC6118] |
URI | _im | [RFC6118] |
URI | _mms | [RFC6118] |
URI | _pres | [RFC6118] |
URI | _pstn | [RFC6118] |
URI | _sctp | [RFC4340][RFC Errata 7067] |
URI | _sip | [RFC6118] |
URI | _sms | [RFC6118] |
URI | _tcp | [RFC4340][RFC Errata 7068] |
URI | _udp | [RFC4340][RFC Errata 7068] |
URI | _unifmsg | [RFC6118] |
URI | _vcard | [RFC6118] |
URI | _videomsg | [RFC6118] |
URI | _voice | [RFC6118] |
URI | _voicemsg | [RFC6118] |
URI | _vpim | [RFC6118] |
URI | _web | [RFC6118] |
URI | _xmpp | [RFC6118] |
CDS | _signal | [RFC9615] |
CDNSKEY | _signal | [RFC9615] |
DSO Type Codes
- Expert(s)
-
Ted Lemon, Sara Dickinson, John Dickinson
- Reference
- [RFC8490]
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
0x0004-0x003F | Standards Action |
0x0040-0xF7FF | Expert Review |
0xF800-0xFBFF | Experimental/Local Use |
0xFC00-0xFFFF | Standards Action |
Type | Name | Early Data | Status | Reference |
---|---|---|---|---|
0x0000 | Reserved | NO | Standards Track | [RFC8490] |
0x0001 | KeepAlive | OK | Standards Track | [RFC8490] |
0x0002 | RetryDelay | NO | Standards Track | [RFC8490] |
0x0003 | EncryptionPadding | NA | Standards Track | [RFC8490] |
0x0004-0x003F | Unassigned, reserved for DSO session-management TLVs | NO | ||
0x0040 | SUBSCRIBE | OK | Standards Track | [RF8765, Section 6.2] |
0x0041 | PUSH | NO | Standards Track | [RF8765, Section 6.3] |
0x0042 | UNSUBSCRIBE | NO | Standards Track | [RF8765, Section 6.4] |
0x0043 | RECONFIRM | NO | Standards Track | [RF8765, Section 6.5] |
0x0044-0xF7FF | Unassigned | NO | ||
0xF800-0xFBFF | Reserved for Experimental/Local Use | NO | [RFC8490] | |
0xFC00-0xFFFF | Reserved for future expansion | NO |
Extended DNS Error Codes
- Reference
- [RFC8914]
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
0-49151 | First Come First Served |
49152-65535 | Private Use |
ZONEMD Schemes
- Expert(s)
-
Warren Kumari, Duane Wessels, Wes Hardaker
- Reference
- [RFC8976]
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
1-239 | Specification Required |
240-254 | Private Use |
Value | Description | Mnemonic | Reference |
---|---|---|---|
0 | Reserved | [RFC8976] | |
1 | Simple ZONEMD collation | SIMPLE | [RFC8976] |
2-239 | Unassigned | ||
240-254 | Reserved for Private Use | N/A | [RFC8976] |
255 | Reserved | [RFC8976] |
ZONEMD Hash Algorithms
- Expert(s)
-
Warren Kumari, Duane Wessels, Wes Hardaker
- Reference
- [RFC8976]
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
1-239 | Specification Required |
240-254 | Private Use |
Value | Description | Mnemonic | Reference |
---|---|---|---|
0 | Reserved | [RFC8976] | |
1 | SHA-384 | SHA384 | [RFC8976] |
2 | SHA-512 | SHA512 | [RFC8976] |
3-239 | Unassigned | ||
240-254 | Reserved for Private Use | N/A | [RFC8976] |
255 | Reserved | [RFC8976] |
DNS Server Cookie Methods
- Expert(s)
-
Ondřej Surý, Donald Eastlake
- Reference
- [RFC9018][RFC7873]
- Note
-
A Server Cookie method (construction and pseudorandom algorithm) is determined by the Version in the first byte of the Cookie and by the Cookie size. Server Cookie size is limited to the inclusive range of 8 to 32 bytes.
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
Version 1-239, Size 8-32 | Expert Review |
Version 240-254, Size 8-32 | Private Use |
Version | Size | Method | Reference |
---|---|---|---|
0 | 8-32 | Reserved | [RFC9018] |
1 | 8-15 | Unassigned | |
1 | 16 | SipHash-2-4 | [RFC9018] |
1 | 17-32 | Unassigned | |
2-239 | 8-32 | Unassigned | |
240-254 | 8-32 | Reserved for Private Use | [RFC9018] |
255 | 8-32 | Reserved | [RFC9018] |
DNS-over-QUIC Error Codes
- Expert(s)
-
Sara Dickinson, Christian Huitema
- Reference
- [RFC9250]
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
provisional (greater than 0x3f) | Expert Review |
provisional registration Date field update | First Come First Served |
permanent, 0x00-0x3f | Standards Action or IESG Approval |
permanent, greater than 0x3f | Specification Required |
Value | Error | Description | Status | Specification | Date | Contact |
---|---|---|---|---|---|---|
0x0 | DOQ_NO_ERROR | No error | permanent | [RFC9250, Section 4.3] | 2022-04-01 | [DPRIVE_WG] |
0x1 | DOQ_INTERNAL_ERROR | Implementation error | permanent | [RFC9250, Section 4.3] | 2022-04-01 | [DPRIVE_WG] |
0x2 | DOQ_PROTOCOL_ERROR | Generic protocol violation | permanent | [RFC9250, Section 4.3] | 2022-04-01 | [DPRIVE_WG] |
0x3 | DOQ_REQUEST_CANCELLED | Request cancelled by client | permanent | [RFC9250, Section 4.3] | 2022-04-01 | [DPRIVE_WG] |
0x4 | DOQ_EXCESSIVE_LOAD | Closing a connection for excessive load | permanent | [RFC9250, Section 4.3] | 2022-04-01 | [DPRIVE_WG] |
0x5 | DOQ_UNSPECIFIED_ERROR | No error reason specified | permanent | [RFC9250, Section 4.3] | 2022-04-01 | [DPRIVE_WG] |
0xd098ea5e | DOQ_ERROR_RESERVED | Alternative error code used for tests | permanent | [RFC9250, Section 4.3] | 2022-04-01 | [DPRIVE_WG] |
DNS Catalog Zones Properties
- Expert(s)
-
Peter Thomassen, Ondřej Surý, Willem Toorop
- Reference
- [RFC9432]
- Note
-
This registry applies to Catalog Zones schema version "2" as specified in [RFC9432].
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
property prefix ends in the label "ext" | Private Use |
all other property prefixes | Expert Review |
Property Prefix | Description | Status | Reference |
---|---|---|---|
zones | List of member zones | Standards Track | [RFC9432] |
version | Schema version | Standards Track | [RFC9432] |
coo | Change of Ownership | Standards Track | [RFC9432] |
group | Group | Standards Track | [RFC9432] |
*.ext | Custom properties | Private Use | [RFC9432] |
DNS Resolver Information Keys
- Registration Procedure(s)
-
Specification Required
- Expert(s)
-
Tirumal Reddy, Mohamed Boucadair, Ben Schwartz
- Reference
- [RFC9606]
- Available Formats
-
CSV
Name | Description | Reference |
---|---|---|
qnamemin | The presence of the key name indicates that QNAME minimisation is enabled. | [RFC9606] |
exterr | Lists the set of enabled extended DNS errors. It must be an INFO-CODE decimal value in the [Extended DNS Error Codes] registry. | [RFC9606] |
infourl | Provides a URL that points to unstructured resolver information that is used for troubleshooting. | [RFC9606] |
ZONEVERSION TYPE Values
- Expert(s)
-
Unassigned
- Reference
- [RFC-ietf-dnsop-zoneversion-11]
- Available Formats
-
CSV
Range | Registration Procedures |
---|---|
0-245 | Specification Required |
246-254 | Private Use |
255 | Reserved for future expansion |
ZONEVERSION TYPE | Mnemonic | Reference |
---|---|---|
0 | SOA-SERIAL | [RFC-ietf-dnsop-zoneversion-11] |
1-245 | Unassigned | |
246-254 | Reserved for Private Use | [RFC-ietf-dnsop-zoneversion-11] |
255 | Reserved for future expansion | [RFC-ietf-dnsop-zoneversion-11] |
Contact Information
ID | Name | Contact URI | Last Updated |
---|---|---|---|
[Cisco_CIE_DNS_team] | Cisco CIE DNS team | mailto:cie-eng.dns-team&cisco.com | 2021-08-31 |
[Donald_E_Eastlake] | Donald E. Eastlake, III | mailto:d3e3e3&gmail.com | 1997-11 |
[DPRIVE_WG] | DPRIVE working group | mailto:dns-privacy&ietf.org | 2022-04-01 |
[Jim_Reid] | Jim Reid | mailto:jim&telnic.org | 2008-01-21 |
[Michael_Patton] | Michael Patton | mailto:map&bbn.com | 1995-06 |
[Otto_Moerbeek] | Otto Moerbeek | mailto:otto.moerbeek&powerdns.com | 2023-03-29 |
[Paul_Hoffman] | Paul Hoffman | mailto:paul.hoffman&icann.org | 2024-07-01 |
[Sam_Weiler] | Sam Weiler | mailto:weiler+iana&tislabs.com | 2005-12 |
[Willem_Toorop] | Willem Toorop | mailto:willem&nlnetlabs.nl | 2022-02-11 |
[Wolfgang_Riedel] | Wolfgang Riedel | mailto:wolfgang&cisco.com | 2016-02-26 |
[Wouter_Wijngaards] | Wouter Wijngaards | mailto:wouter&nlnetlabs.nl | 2010-02-17 |
Footnotes
[1] |
In [RFC1002], 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 |
[2] |
From [RFC8552, Section 4.1.3 _ta]: Under the NULL RR, the entry "_ta-*" denotes all node names beginning with the string "_ta-*". It does NOT refer to a DNS wildcard specification. |