Concise Binary Object Representation (CBOR) Tags

Created
2013-09-19
Last Updated
2020-12-09
Available Formats

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Registry included below

CBOR Tags

Expert(s)
Carsten Bormann
Reference
[RFC8949]
Note
All registration requests must include the template from [RFC8949].
Available Formats

CSV
Range Registration Procedures
0-23 Standards Action
24-32767 Specification Required
32768-18446744073709551615 First Come First Served
Tag Data Item Semantics Reference
0 text string Standard date/time string; see Section 3.4.1 [RFC8949]
1 integer or float Epoch-based date/time; see Section 3.4.2 [RFC8949]
2 byte string Positive bignum; see Section 3.4.3 [RFC8949]
3 byte string Negative bignum; see Section 3.4.3 [RFC8949]
4 array Decimal fraction; see Section 3.4.4 [RFC8949]
5 array Bigfloat; see Section 3.4.4 [RFC8949]
6-15 Unassigned
16 COSE_Encrypt0 COSE Single Recipient Encrypted Data Object [RFC8152]
17 COSE_Mac0 COSE Mac w/o Recipients Object [RFC8152]
18 COSE_Sign1 COSE Single Signer Data Object [RFC8152]
19-20 Unassigned
21 (any) Expected conversion to base64url encoding; see Section 3.4.5.2 [RFC8949]
22 (any) Expected conversion to base64 encoding; see Section 3.4.5.2 [RFC8949]
23 (any) Expected conversion to base16 encoding; see Section Section 3.4.5.2 [RFC8949]
24 byte string Encoded CBOR data item; see Section 3.4.5.1 [RFC8949]
25 unsigned integer reference the nth previously seen string [http://cbor.schmorp.de/stringref][Marc_A._Lehmann]
26 array Serialised Perl object with classname and constructor arguments [http://cbor.schmorp.de/perl-object][Marc_A._Lehmann]
27 array Serialised language-independent object with type name and constructor arguments [http://cbor.schmorp.de/generic-object][Marc_A._Lehmann]
28 multiple mark value as (potentially) shared [http://cbor.schmorp.de/value-sharing][Marc_A._Lehmann]
29 unsigned integer reference nth marked value [http://cbor.schmorp.de/value-sharing][Marc_A._Lehmann]
30 array Rational number [http://peteroupc.github.io/CBOR/rational.html][Peter_Occil]
31 Undefined (0xf7) Absent value in a CBOR Array [https://github.com/svaarala/cbor-specs/blob/master/cbor-absent-tag.rst][Sami_Vaarala]
32 text string URI; see Section 3.4.5.3 [RFC8949]
33 text string base64url; see Section 3.4.5.3 [RFC8949]
34 text string base64; see Section 3.4.5.3 [RFC8949]
35 UTF-8 string Regular expression; see Section 2.4.4.3 [RFC7049]
36 text string MIME message; see Section 3.4.5.3 [RFC8949]
37 byte string Binary UUID ([RFC4122] section 4.1.2) [https://github.com/lucas-clemente/cbor-specs/blob/master/uuid.md][Lucas_Clemente]
38 array Language-tagged string [http://peteroupc.github.io/CBOR/langtags.html][Peter_Occil]
39 multiple Identifier [https://github.com/lucas-clemente/cbor-specs/blob/master/id.md][Lucas_Clemente]
40 array of two arrays [1] Multi-dimensional Array, row-major order [RFC8746]
41 array Homogeneous Array [RFC8746]
42 byte string IPLD content identifier [https://github.com/ipld/cid-cbor/][Volker_Mische]
43 byte string YANG bits datatype; see Section 6.7. [draft-ietf-core-yang-cbor]
44 unsigned integer YANG enumeration datatype; see Section 6.6. [draft-ietf-core-yang-cbor]
45 unsigned integer or text string YANG identityref datatype; see Section 6.10. [draft-ietf-core-yang-cbor]
46 unsigned integer or text string or array YANG instance-identifier datatype; see Section 6.13. [draft-ietf-core-yang-cbor]
47 unsigned integer YANG Schema Item iDentifier (sid); see Section 3.2. [draft-ietf-core-yang-cbor]
48-60 Unassigned
61 CBOR Web Token (CWT) CBOR Web Token (CWT) [RFC8392][Michael_B._Jones]
62 Unassigned
63 byte string Encoded CBOR Sequence [RFC8742] [draft-bormann-cbor-notable-tags-02, Section 2.1]
64 byte string uint8 Typed Array [RFC8746]
65 byte string uint16, big endian, Typed Array [RFC8746]
66 byte string uint32, big endian, Typed Array [RFC8746]
67 byte string uint64, big endian, Typed Array [RFC8746]
68 byte string uint8 Typed Array, clamped arithmetic [RFC8746]
69 byte string uint16, little endian, Typed Array [RFC8746]
70 byte string uint32, little endian, Typed Array [RFC8746]
71 byte string uint64, little endian, Typed Array [RFC8746]
72 byte string sint8 Typed Array [RFC8746]
73 byte string sint16, big endian, Typed Array [RFC8746]
74 byte string sint32, big endian, Typed Array [RFC8746]
75 byte string sint64, big endian, Typed Array [RFC8746]
76 byte string (reserved) [RFC8746]
77 byte string sint16, little endian, Typed Array [RFC8746]
78 byte string sint32, little endian, Typed Array [RFC8746]
79 byte string sint64, little endian, Typed Array [RFC8746]
80 byte string IEEE 754 binary16, big endian, Typed Array [RFC8746]
81 byte string IEEE 754 binary32, big endian, Typed Array [RFC8746]
82 byte string IEEE 754 binary64, big endian, Typed Array [RFC8746]
83 byte string IEEE 754 binary128, big endian, Typed Array [RFC8746]
84 byte string IEEE 754 binary16, little endian, Typed Array [RFC8746]
85 byte string IEEE 754 binary32, little endian, Typed Array [RFC8746]
86 byte string IEEE 754 binary64, little endian, Typed Array [RFC8746]
87 byte string IEEE 754 binary128, little endian, Typed Array [RFC8746]
88-95 Unassigned
96 COSE_Encrypt COSE Encrypted Data Object [RFC8152]
97 COSE_Mac COSE MACed Data Object [RFC8152]
98 COSE_Sign COSE Signed Data Object [RFC8152]
99 Unassigned
100 Unsigned or negative integer Number of days since the epoch date 1970-01-01 [RFC8943]
101-102 Unassigned
103 array Geographic Coordinates [https://github.com/allthingstalk/cbor/blob/master/CBOR-Tag103-Geographic-Coordinates.md][Danilo_Vidovic]
104 multiple Geographic Coordinate Reference System WKT or EPSG number [draft-clarke-cbor-crs]
105-119 Unassigned
120 multiple Internet of Things Data Point [https://github.com/allthingstalk/cbor/blob/master/CBOR-Tag120-Internet-of-Things-Data-Points.md][Danilo_Vidovic]
121-255 Unassigned
256 multiple mark value as having string references [http://cbor.schmorp.de/stringref][Marc_A._Lehmann]
257 byte string Binary MIME message [http://peteroupc.github.io/CBOR/binarymime.html][Peter_Occil]
258 array Mathematical finite set [https://github.com/input-output-hk/cbor-sets-spec/blob/master/CBOR_SETS.md][Alfredo_Di_Napoli]
259 map Map datatype with key-value operations (e.g. `.get()/.set()/.delete()`) [https://github.com/shanewholloway/js-cbor-codec/blob/master/docs/CBOR-259-spec--explicit-maps.md][Shane_Holloway]
260 byte string Network Address (IPv4 or IPv6 or MAC Address) [http://www.employees.org/~ravir/cbor-network.txt][Ravi_Raju]
261 map (IPAddress + Mask Length) Network Address Prefix (IPv4 or IPv6 Address + Mask Length) [https://github.com/toravir/CBOR-Tag-Specs/blob/master/networkPrefix.md][Ravi_Raju]
262 byte string Embedded JSON Object [https://github.com/toravir/CBOR-Tag-Specs/blob/master/embeddedJSON.md][Ravi_Raju]
263 byte string Hexadecimal string [https://github.com/toravir/CBOR-Tag-Specs/blob/master/hexString.md][Ravi_Raju]
264 array Decimal fraction with arbitrary exponent [http://peteroupc.github.io/CBOR/bigfrac.html][Peter_Occil]
265 array Bigfloat with arbitrary exponent [http://peteroupc.github.io/CBOR/bigfrac.html][Peter_Occil]
266 text string Internationalized resource identifier (IRI) [https://peteroupc.github.io/CBOR/iri.html][Peter_Occil]
267 text string Internationalized resource identifier reference (IRI reference) [https://peteroupc.github.io/CBOR/iri.html][Peter_Occil]
268 array Extended decimal fraction [https://peteroupc.github.io/CBOR/extended.html][Peter_Occil]
269 array Extended bigfloat [https://peteroupc.github.io/CBOR/extended.html][Peter_Occil]
270 array Extended rational number [https://peteroupc.github.io/CBOR/extended.html][Peter_Occil]
271 DDoS Open Threat Signaling (DOTS) signal channel object DDoS Open Threat Signaling (DOTS) signal channel object, as defined in [RFC8782] [RFC8782]
272 byte string Non-UTF-8 CESU-8 string [https://github.com/svaarala/cbor-specs/blob/master/cbor-nonutf8-string-tags.rst][Sami_Vaarala]
273 byte string Non-UTF-8 WTF-8 string [https://github.com/svaarala/cbor-specs/blob/master/cbor-nonutf8-string-tags.rst][Sami_Vaarala]
274 byte string Non-UTF-8 MUTF-8 string [https://github.com/svaarala/cbor-specs/blob/master/cbor-nonutf8-string-tags.rst][Sami_Vaarala]
275 map (major type 5) Map contains only keys that are of type Text String (major type 3) [https://github.com/ecorm/cbor-tag-text-key-map][Emile_Cormier]
276-1000 Unassigned
1001 map extended time [draft-bormann-cbor-time-tag-01]
1002 map duration [draft-bormann-cbor-time-tag-01]
1003 map period [draft-bormann-cbor-time-tag-01]
1004 UTF-8 text string [RFC3339] full-date string [RFC8943]
1005-1039 Unassigned
1040 array of two arrays [1] Multi-dimensional Array, column-major order [RFC8746]
1041-22097 Unassigned
22098 multiple hint that indicates an additional level of indirection [http://cbor.schmorp.de/indirection][Marc_A._Lehmann]
22099-55798 Unassigned
55799 (any) Self-described CBOR; see Section 3.4.6 [RFC8949]
55800-65534 Unassigned
65535 (none valid) always invalid [draft-bormann-cbor-notable-tags-02, Section 10.1]
65536-15309735 Unassigned
15309736 map (major type 5) RAINS Message [https://britram.github.io/rains-prototype][Brian_Trammell]
15309737-4294967294 Unassigned
4294967295 (none valid) always invalid [draft-bormann-cbor-notable-tags-02, Section 10.1]
4294967296-18446744073709551614 Unassigned
18446744073709551615 (none valid) always invalid [draft-bormann-cbor-notable-tags-02, Section 10.1]

Contact Information

ID Name Contact URI Last Updated
[Alfredo_Di_Napoli] Alfredo Di Napoli mailto:alfredo.dinapoli&iohk.io 2017-08-25
[Brian_Trammell] Brian Trammell mailto:ietf&trammell.ch 2016-08-17
[Danilo_Vidovic] Danilo Vidovic mailto:cbor&allthingstalk.com 2018-04-17
[Emile_Cormier] Emile Cormier mailto:emile.cormier.jr&gmail.com 2020-03-30
[Lucas_Clemente] Lucas Clemente mailto:lucas&clemente.io 2014-07-01
[Marc_A._Lehmann] Marc A. Lehmann mailto:cbor&schmorp.de 2013-11-26
[Michael_B._Jones] Michael B. Jones mailto:mbj&microsoft.com 2018-05-04
[Peter_Occil] Peter Occil mailto:poccil14&gmail.com 2018-11-09
[Ravi_Raju] Ravi Raju mailto:ravir&employees.org 2018-03-06
[Sami_Vaarala] Sami Vaarala mailto:sami.vaarala&iki.fi 2020-03-18
[Shane_Holloway] Shane Holloway mailto:shane.holloway&ieee.org 2018-10-25
[Volker_Mische] Volker Mische mailto:volker&protocol.ai 2019-08-23

Footnote

[1] 
second element of outer array in data item is native CBOR array 
(major type 4) or Typed Array (one of Tag 64..87)