Internet Assigned Numbers Authority
??Domains
??Protocols
??Numbers
??About
Domain Name System (DNS) Parameters
Last Updated
2025-09-30
Available Formats
[IMG]
XML [IMG]
HTML [IMG]
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
??DSYNC: Location of Synchronization Endpoints
DNS CLASSes
Expert(s)
Petr ?pa?ek, 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
[IMG]
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, ?lafur Gu?mundsson, 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
[IMG]
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]
an
NS 2 authoritative [RFC1035]
name server
a mail
MD 3 destination [RFC1035]
(OBSOLETE - use
MX)
a mail
MF 4 forwarder [RFC1035]
(OBSOLETE - use
MX)
the canonical
CNAME 5 name for an [RFC1035]
alias
marks the start
SOA 6 of a zone of [RFC1035]
authority
a mailbox
MB 7 domain name [RFC1035]
(EXPERIMENTAL)
a mail group
MG 8 member [RFC1035]
(EXPERIMENTAL)
a mail rename
MR 9 domain name [RFC1035]
(EXPERIMENTAL)
NULL 10 a null RR [RFC1035]
(EXPERIMENTAL)
a well known
WKS 11 service [RFC1035]
description
PTR 12 a domain name [RFC1035]
pointer
HINFO 13 host [RFC1035]
information
mailbox or mail
MINFO 14 list [RFC1035]
information
MX 15 mail exchange [RFC1035]
TXT 16 text strings [RFC1035]
RP 17 for Responsible [RFC1183]
Person
AFSDB 18 for AFS Data [RFC1183][RFC5864]
Base location
X25 19 for X.25 PSDN [RFC1183]
address
ISDN 20 for ISDN [RFC1183]
address
RT 21 for Route [RFC1183]
Through
for NSAP
NSAP 22 address, NSAP [RFC1706][Moving TPC.INT and NSAP.INT infrastructure domains to
style A record historic]
(DEPRECATED)
for domain name
NSAP-PTR 23 pointer, NSAP [RFC1706][Moving TPC.INT and NSAP.INT infrastructure domains to
style historic]
(DEPRECATED)
SIG 24 for security [RFC2536][RFC2931][RFC3110][RFC4034]
signature
KEY 25 for security [RFC2536][RFC2539][RFC3110][RFC4034]
key
X.400 mail
PX 26 mapping [RFC2163]
information
GPOS 27 Geographical [RFC1712]
Position
AAAA 28 IP6 Address [RFC3596]
LOC 29 Location [RFC1876]
Information
NXT 30 Next Domain [RFC2535][RFC3755]
(OBSOLETE)
EID 31 Endpoint [Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt] 1995-06
Identifier
NIMLOC 32 Nimrod Locator [1][Michael_Patton][http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt] 1995-06
SRV 33 Server [1][RFC2782]
Selection
[ ATM Forum Technical Committee, "ATM Name System, V2.0", Doc ID:
ATMA 34 ATM Address AF-DANS-0152.000, July 2000. Available from and held in escrow by
IANA.]
Naming
NAPTR 35 Authority [RFC3403]
Pointer
KX 36 Key Exchanger [RFC2230]
CERT 37 CERT [RFC4398]
A6 38 A6 (OBSOLETE - [RFC2874][RFC3226][RFC6563]
use AAAA)
DNAME 39 DNAME [RFC6672]
SINK 40 SINK [Donald_E_Eastlake][draft-eastlake-kitchen-sink-02] 1997-11
OPT 41 OPT [RFC3225][RFC6891]
APL 42 APL [RFC3123]
DS 43 Delegation [RFC4034]
Signer
SSHFP 44 SSH Key [RFC4255]
Fingerprint
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 [RFC8162] SMIMEA/smimea-completed-template 2015-12-01
association
Unassigned 54
HIP 55 Host Identity [RFC8005]
Protocol
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 [Wouter_Wijngaards] TALINK/talink-completed-template 2010-02-17
LINK
CDS 59 Child DS [RFC7344] CDS/cds-completed-template 2011-06-06
DNSKEY(s) the
CDNSKEY 60 Child wants [RFC7344] 2014-06-16
reflected in DS
OPENPGPKEY 61 OpenPGP Key [RFC7929] OPENPGPKEY/openpgpkey-completed-template 2014-08-12
CSYNC 62 Child-To-Parent [RFC7477] 2015-01-27
Synchronization
ZONEMD 63 Message Digest [RFC8976] ZONEMD/zonemd-completed-template 2018-12-12
Over Zone Data
SVCB 64 General-purpose [RFC9460] SVCB/svcb-completed-template 2020-06-30
service binding
SVCB-compatible
HTTPS 65 type for use [RFC9460] HTTPS/https-completed-template 2020-06-30
with HTTP
Endpoint
DSYNC 66 discovery for [RFC9859] DSYNC/dsync-completed-template 2024-12-10
delegation
synchronization
Hierarchical
HHIT 67 Host Identity [draft-ietf-drip-registries-28] HHIT/hhit-completed-template 2025-05-20
Tag
UAS Broadcast
BRID 68 Remote [draft-ietf-drip-registries-28] BRID/brid-completed-template 2025-05-20
Identification
Unassigned 69-98
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 [RFC7043] EUI48/eui48-completed-template 2013-03-27
address
EUI64 109 an EUI-64 [RFC7043] EUI64/eui64-completed-template 2013-03-27
address
Unassigned 110-127
NXDOMAIN
NXNAME 128 indicator for [RFC9824] NXNAME/nxname-completed-template 2024-07-18
Compact Denial
of Existence
Unassigned 129-248
TKEY 249 Transaction Key [RFC2930]
TSIG 250 Transaction [RFC8945]
Signature
IXFR 251 incremental [RFC1995]
transfer
AXFR 252 transfer of an [RFC1035][RFC5936]
entire zone
mailbox-related
MAILB 253 RRs (MB, MG or [RFC1035]
MR)
mail agent RRs
MAILA 254 (OBSOLETE - see [RFC1035]
MX)
A request for
some or all
* 255 records the [RFC1035][RFC6895][RFC8482]
server has
available
URI 256 URI [RFC7553] URI/uri-completed-template 2011-02-22
Certification
CAA 257 Authority [RFC8659] CAA/caa-completed-template 2011-04-07
Restriction
Application
AVC 258 Visibility and [Wolfgang_Riedel] AVC/avc-completed-template 2016-02-26
Control
DOA 259 Digital Object [draft-durand-doa-over-dns-02] DOA/doa-completed-template 2017-08-30
Architecture
Automatic
AMTRELAY 260 Multicast [RFC8777] AMTRELAY/amtrelay-completed-template 2019-02-06
Tunneling Relay
Resolver
RESINFO 261 Information as [RFC9606] RESINFO/resinfo-completed-template 2023-11-02
Key/Value Pairs
WALLET 262 Public wallet [Paul_Hoffman] WALLET/wallet-completed-template 2024-06-21
address
CLA 263 BP Convergence [draft-johnson-dns-ipn-cla-07] CLA/cla-completed-template 2024-07-25
Layer Adapter
IPN 264 BP Node Number [draft-johnson-dns-ipn-cla-07] IPN/ipn-completed-template 2024-07-25
Unassigned 265-32767
DNSSEC Trust [Sam_Weiler][ Deploying DNSSEC Without a Signed Root. Technical
TA 32768 Authorities Report 1999-19, Information Networking Institute, Carnegie Mellon 2005-12-13
University, April 2004.]
DNSSEC
DLV 32769 Lookaside [RFC8749][RFC4431]
Validation
(OBSOLETE)
Unassigned 32770-65279
Private 65280-65534
use
Reserved 65535
DNS OpCodes
Registration Procedure(s)
Standards Action
Reference
[RFC6895][RFC1035]
Available Formats
[IMG]
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
[IMG]
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
[IMG]
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)
?lafur Gu?mundsson
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
[IMG]
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 [RFC4701]
DHCPv4 client's Client Identifier option).
0x0003-0xFFFE Unassigned [RFC4701]
0xFFFF Reserved [RFC4701]
DHCID RR Digest Type Codes
Registration Procedure(s)
Standards Action
Reference
[RFC4701]
Available Formats
[IMG]
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
[IMG]
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 Standard [RFC1035]
the compression target.
0 1 Extended label type the lower 6 bits of this type (section 3) indicate the type of Proposed [RFC6891]
label in use
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)
?lafur Gu?mundsson (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
[IMG]
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 [RFC9664]
3 NSID Standard [RFC5001]
4 Reserved [draft-cheshire-edns0-owner-option-00]
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-01]
17 EDNS-Server-Tag Optional [draft-bellis-dnsop-edns-tags-01]
18 Report-Channel Standard [RFC9567]
19 ZONEVERSION Standard [RFC9660]
20 MQTYPE-Query Optional [draft-ietf-dnssd-multi-qtypes-07]
21 MQTYPE-Response Optional [draft-ietf-dnssd-multi-qtypes-07]
22-20291 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
Reserved for
65001-65534 Local/Experimental [RFC6891]
Use
65535 Reserved for [RFC6891]
future expansion
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
[IMG]
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
[IMG]
CSV
Bit Flag Description Reference
Bit 0 DO DNSSEC answer OK [RFC4035][RFC3225][RFC6840][RFC Errata 4928]
Bit 1 CO Compact Answers OK [RFC9824]
Bit 2-15 Reserved
EDNS version Number (8 bits)
Registration Procedure(s)
Standards Action
Reference
[RFC6891]
Available Formats
[IMG]
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
[IMG]
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
[IMG]
CSV
RR Type _NODE NAME Reference
* _example [RFC8552, Section 4.1.4]
CDNSKEY _signal [RFC9615]
CDS _signal [RFC9615]
DSYNC _dsync [RFC9859]
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 _stun [RFC8489, Section 8.1]
SRV _stuns [RFC8489, Section 8.1]
SRV _tcp [RFC2782]
SRV _turn [RFC8656, Section 4.1]
SRV _turns [RFC8656, Section 4.1]
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 [RFC-ietf-dmarc-dmarcbis-41]
TXT _domainkey [RFC6376]
TXT _er [RFC9567]
TXT _mta-sts [RFC8461]
TXT _spf [RFC7208]
TXT _splitdns-challenge [RFC9704]
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]
DSO Type Codes
Expert(s)
Ted Lemon, Sara Dickinson, John Dickinson
Reference
[RFC8490]
Available Formats
[IMG]
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
[IMG]
CSV
Range Registration Procedures
0-49151 First Come First Served
49152-65535 Private Use
INFO-CODE Purpose Reference
0 Other Error [RFC8914, Section 4.1]
1 Unsupported DNSKEY Algorithm [RFC8914, Section 4.2]
2 Unsupported DS Digest Type [RFC8914, Section 4.3]
3 Stale Answer [RFC8914, Section 4.4][RFC8767]
4 Forged Answer [RFC8914, Section 4.5]
5 DNSSEC Indeterminate [RFC8914, Section 4.6]
6 DNSSEC Bogus [RFC8914, Section 4.7]
7 Signature Expired [RFC8914, Section 4.8]
8 Signature Not Yet Valid [RFC8914, Section 4.9]
9 DNSKEY Missing [RFC8914, Section 4.10]
10 RRSIGs Missing [RFC8914, Section 4.11]
11 No Zone Key Bit Set [RFC8914, Section 4.12]
12 NSEC Missing [RFC8914, Section 4.13]
13 Cached Error [RFC8914, Section 4.14]
14 Not Ready [RFC8914, Section 4.15]
15 Blocked [RFC8914, Section 4.16]
16 Censored [RFC8914, Section 4.17]
17 Filtered [RFC8914, Section 4.18]
18 Prohibited [RFC8914, Section 4.19]
19 Stale NXDomain Answer [RFC8914, Section 4.20]
20 Not Authoritative [RFC8914, Section 4.21]
21 Not Supported [RFC8914, Section 4.22]
22 No Reachable Authority [RFC8914, Section 4.23]
23 Network Error [RFC8914, Section 4.24]
24 Invalid Data [RFC8914, Section 4.25]
25 Signature Expired before Valid [https://github.com/NLnetLabs/unbound/pull/604#discussion_r802678343][Willem_Toorop]
26 Too Early [RFC9250]
27 Unsupported NSEC3 Iterations Value [RFC9276]
28 Unable to conform to policy [draft-homburg-dnsop-codcp-00]
29 Synthesized [https://github.com/PowerDNS/pdns/pull/12334][Otto_Moerbeek]
30 Invalid Query Type [RFC9824]
31-49151 Unassigned
49152-65535 Reserved for Private Use [RFC8914, Section 5.2]
ZONEMD Schemes
Expert(s)
Warren Kumari, Duane Wessels, Wes Hardaker
Reference
[RFC8976]
Available Formats
[IMG]
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
[IMG]
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)
Ond?ej Sur?, 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
[IMG]
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
[IMG]
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, Ond?ej Sur?, Willem Toorop
Reference
[RFC9432]
Note
This registry applies to Catalog Zones schema version "2" as specified
in [RFC9432].
Available Formats
[IMG]
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
[IMG]
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] [RFC9606]
registry.
infourl Provides a URL that points to unstructured resolver information that is used for troubleshooting. [RFC9606]
ZONEVERSION TYPE Values
Expert(s)
Hugo Salgado, Mauricio Vergara Ereche, Duane Wessels
Reference
[RFC9660]
Available Formats
[IMG]
CSV
Range Registration Procedures
0-245 Specification Required
246-254 Private Use
255 Reserved
ZONEVERSION TYPE Mnemonic Reference
0 SOA-SERIAL [RFC9660]
1-245 Unassigned
246-254 Reserved for Private Use [RFC9660]
255 Reserved [RFC9660]
DSYNC: Location of Synchronization Endpoints
Registration Procedure(s)
Expert Review
Expert(s)
Unassigned
Reference
[RFC9859]
Available Formats
[IMG]
CSV
RRtype Scheme (Mnemonic) Purpose Reference
0 Null scheme (no-op) [RFC9859]
CDS 1 (NOTIFY) Delegation management [RFC9859]
CSYNC 1 (NOTIFY) Delegation management [RFC9859]
2-127 Unassigned
128-255 Reserved for Private Use [RFC9859]
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.
Licensing Terms
Presently we were in a very dark road, and at a point where it dropped suddenly between steep sides we halted in black shadow. A gleam of pale sand, a whisper of deep flowing waters, and a farther glimmer of more sands beyond them challenged our advance. We had come to a "grapevine ferry." The scow was on the other side, the water too shoal for the horses to swim, and the bottom, most likely, quicksand. Out of the blackness of the opposite shore came a soft, high-pitched, quavering, long-drawn, smothered moan of woe, the call of that snivelling little sinner the screech-owl. Ferry murmured to me to answer it and I sent the same faint horror-stricken tremolo back. Again it came to us, from not farther than one might toss his cap, and I followed Ferry down to the water's edge. The grapevine guy swayed at our side, we heard the scow slide from the sands, and in a few moments, moved by two videttes, it touched our shore. Soon we were across, the two videttes riding with us, and beyond a sharp rise, in an old opening made by the swoop of a hurricane, we entered the silent unlighted bivouac of Ferry's scouts. Ferry got down and sat on the earth talking with Quinn, while the sergeants quietly roused the sleepers to horse. Plotinus is driven by this perplexity to reconsider the whole theory of Matter.477 He takes Aristotle¡¯s doctrine as the groundwork of his investigation. According to this, all existence is divided into Matter and Form. What we know of things¡ªin other words, the sum of their differential characteristics¡ªis their Form. Take away this, and the unknowable residuum is their Matter. Again, Matter is the vague indeterminate something out of which particular Forms are developed. The two are related as Possibility to Actuality, as the more generic to the more specific substance through every grade of classification and composition. Thus there are two Matters, the one sensible and the other intelligible. The former constitutes the common substratum of bodies, the other the common element of ideas.478 The general distinction between Matter and Form was originally suggested to Aristotle by Plato¡¯s remarks on the same subject; but he differs325 from his master in two important particulars. Plato, in his Timaeus, seems to identify Matter with space.479 So far, it is a much more positive conception than the ?λη of the Metaphysics. On the other hand, he constantly opposes it to reality as something non-existent; and he at least implies that it is opposed to absolute good as a principle of absolute evil.480 Thus while the Aristotelian world is formed by the development of Power into Actuality, the Platonic world is composed by the union of Being and not-Being, of the Same and the Different, of the One and the Many, of the Limit and the Unlimited, of Good and Evil, in varying proportions with each other. The Lawton woman had heard of an officer's family at Grant, which was in need of a cook, and had gone there. [See larger version] On the 8th of July an extraordinary Privy Council was summoned. All the members, of whatever party, were desired to attend, and many were the speculations as to the object of their meeting. The general notion was that it involved the continuing or the ending of the war. It turned out to be for the announcement of the king's intended marriage. The lady selected was Charlotte, the second sister of the Duke of Mecklenburg-Strelitz. Apart from the narrowness of her education, the young princess had a considerable amount of amiability, good sense, and domestic taste. These she shared with her intended husband, and whilst they made the royal couple always retiring, at the same time they caused them to give, during their lives, a moral air to their court. On the 8th of September Charlotte arrived at St. James's, and that afternoon the marriage took place, the ceremony being performed by the Archbishop of Canterbury. On the 22nd the coronation took place with the greatest splendour. Mother and girls were inconsolable, for each had something that they were sure "Si would like," and would "do him good," but they knew Josiah Klegg, Sr., well enough to understand what was the condition when he had once made up his mind. CHAPTER V. THE YOUNG RECRUITS Si proceeded to deftly construct a litter out of the two guns, with some sticks that he cut with a knife, and bound with pawpaw strips. His voice had sunk very low, almost to sweetness. A soft flurry of pink went over her face, and her eyelids drooped. Then suddenly she braced herself, pulled herself taut, grew combative again, though her voice shook. HoME²Ô¾®Ïè̫ʲôÐÇ×ù
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