Concise Binary Object Representation (CBOR) Tags

Last Updated
Available Formats



Plain text

Registry included below


Carsten Bormann
All registration requests must include the template from [RFC7049].
Available Formats

Range Registration Procedures
0-23 Standards Action
24-255 Specification Required
256-18446744073709551615 First Come First Served
Tag Data Item Semantics Reference
0 UTF-8 string Standard date/time string; see Section 2.4.1 [RFC7049]
1 multiple Epoch-based date/time; see Section 2.4.1 [RFC7049]
2 byte string Positive bignum; see Section 2.4.2 [RFC7049]
3 byte string Negative bignum; see Section 2.4.2 [RFC7049]
4 array Decimal fraction; see Section 2.4.3 [RFC7049]
5 array Bigfloat; see Section 2.4.3 [RFC7049]
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 multiple Expected conversion to base64url encoding; see Section [RFC7049]
22 multiple Expected conversion to base64 encoding; see Section [RFC7049]
23 multiple Expected conversion to base16 encoding; see Section [RFC7049]
24 byte string Encoded CBOR data item; see Section [RFC7049]
25 unsigned integer reference the nth previously seen string [][Marc_A._Lehmann]
26 array Serialised Perl object with classname and constructor arguments [][Marc_A._Lehmann]
27 array Serialised language-independent object with type name and constructor arguments [][Marc_A._Lehmann]
28 multiple mark value as (potentially) shared [][Marc_A._Lehmann]
29 unsigned integer reference nth marked value [][Marc_A._Lehmann]
30 array Rational number [][Peter_Occil]
31 Unassigned
32 UTF-8 string URI; see Section [RFC7049]
33 UTF-8 string base64url; see Section [RFC7049]
34 UTF-8 string base64; see Section [RFC7049]
35 UTF-8 string Regular expression; see Section [RFC7049]
36 UTF-8 string MIME message; see Section [RFC7049]
37 byte string Binary UUID ([RFC4122] section 4.1.2) [][Lucas_Clemente]
38 array Language-tagged string [][Peter_Occil]
39 multiple Identifier [][Lucas_Clemente]
40 array of two arrays [1] Multi-dimensional Array, row-major order [draft-ietf-cbor-array-tags]
41 array Homogeneous Array [draft-ietf-cbor-array-tags]
42 byte string IPLD content identifier [][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]
62-63 Unassigned
64 byte string uint8 Typed Array [draft-ietf-cbor-array-tags]
65 byte string uint16, big endian, Typed Array [draft-ietf-cbor-array-tags]
66 byte string uint32, big endian, Typed Array [draft-ietf-cbor-array-tags]
67 byte string uint64, big endian, Typed Array [draft-ietf-cbor-array-tags]
68 byte string uint8 Typed Array, clamped arithmetic [draft-ietf-cbor-array-tags]
69 byte string uint16, little endian, Typed Array [draft-ietf-cbor-array-tags]
70 byte string uint32, little endian, Typed Array [draft-ietf-cbor-array-tags]
71 byte string uint64, little endian, Typed Array [draft-ietf-cbor-array-tags]
72 byte string sint8 Typed Array [draft-ietf-cbor-array-tags]
73 byte string sint16, big endian, Typed Array [draft-ietf-cbor-array-tags]
74 byte string sint32, big endian, Typed Array [draft-ietf-cbor-array-tags]
75 byte string sint64, big endian, Typed Array [draft-ietf-cbor-array-tags]
76 byte string (reserved) [draft-ietf-cbor-array-tags]
77 byte string sint16, little endian, Typed Array [draft-ietf-cbor-array-tags]
78 byte string sint32, little endian, Typed Array [draft-ietf-cbor-array-tags]
79 byte string sint64, little endian, Typed Array [draft-ietf-cbor-array-tags]
80 byte string IEEE 754 binary16, big endian, Typed Array [draft-ietf-cbor-array-tags]
81 byte string IEEE 754 binary32, big endian, Typed Array [draft-ietf-cbor-array-tags]
82 byte string IEEE 754 binary64, big endian, Typed Array [draft-ietf-cbor-array-tags]
83 byte string IEEE 754 binary128, big endian, Typed Array [draft-ietf-cbor-array-tags]
84 byte string IEEE 754 binary16, little endian, Typed Array [draft-ietf-cbor-array-tags]
85 byte string IEEE 754 binary32, little endian, Typed Array [draft-ietf-cbor-array-tags]
86 byte string IEEE 754 binary64, little endian, Typed Array [draft-ietf-cbor-array-tags]
87 byte string IEEE 754 binary128, little endian, Typed Array [draft-ietf-cbor-array-tags]
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]
99-102 Unassigned
103 array Geographic Coordinates [][Danilo_Vidovic]
104-119 Unassigned
120 multiple Internet of Things Data Point [][Danilo_Vidovic]
121-255 Unassigned
256 multiple mark value as having string references [][Marc_A._Lehmann]
257 byte string Binary MIME message [][Peter_Occil]
258 array Mathematical finite set [][Alfredo_Di_Napoli]
259 map Map datatype with key-value operations (e.g. `.get()/.set()/.delete()`) [][Shane_Holloway]
260 byte string Network Address (IPv4 or IPv6 or MAC Address) [][Ravi_Raju]
261 map (IPAddress + Mask Length) Network Address Prefix (IPv4 or IPv6 Address + Mask Length) [][Ravi_Raju]
262 byte string Embedded JSON Object [][Ravi_Raju]
263 byte string Hexadecimal string [][Ravi_Raju]
264 array Decimal fraction with arbitrary exponent [][Peter_Occil]
265 array Bigfloat with arbitrary exponent [][Peter_Occil]
266 text string Internationalized resource identifier (IRI) [][Peter_Occil]
267 text string Internationalized resource identifier reference (IRI reference) [][Peter_Occil]
268 array Extended decimal fraction [][Peter_Occil]
269 array Extended bigfloat [][Peter_Occil]
270 array Extended rational number [][Peter_Occil]
271-1000 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]
1004-1039 Unassigned
1040 array of two arrays [1] Multi-dimensional Array, column-major order [draft-ietf-cbor-array-tags]
1041-22097 Unassigned
22098 multiple hint that indicates an additional level of indirection [][Marc_A._Lehmann]
22099-55798 Unassigned
55799 multiple Self-describe CBOR; see Section 2.4.5 [RFC7049]
55800-15309735 Unassigned
15309736 map (major type 5) RAINS Message [][Brian_Trammell]
15309737-18446744073709551615 Unassigned


ID Name Contact URI Last Updated
[Alfredo_Di_Napoli] Alfredo Di Napoli mailto:alfredo.dinapoli& 2017-08-25
[Brian_Trammell] Brian Trammell mailto:ietf& 2016-08-17
[Danilo_Vidovic] Danilo Vidovic mailto:cbor& 2018-04-17
[Lucas_Clemente] Lucas Clemente mailto:lucas& 2014-07-01
[Marc_A._Lehmann] Marc A. Lehmann mailto:cbor& 2013-11-26
[Michael_B._Jones] Michael B. Jones mailto:mbj& 2018-05-04
[Peter_Occil] Peter Occil mailto:poccil14& 2018-11-09
[Ravi_Raju] Ravi Raju mailto:ravir& 2018-03-06
[Shane_Holloway] Shane Holloway mailto:shane.holloway& 2018-10-25
[Volker_Mische] Volker Mische mailto:volker& 2019-08-23


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