International Telecommunications Union - Telecommunication standardization sector (ITU-T)
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Subsequent OIDs identify ITU-T Recommendations (not jointly published with ISO/IEC) and ITU members.
This arc is also called ccitt(0) to recall that CCITT used to be an organization independent from ITU-T.
Identifier itu-r was added by ITU-T Study Group 17 in March 2004 (and was ratified by ISO/IEC JTC 1/SC 6 in Sep 2005). It can only be used as a 'NameAndNumberForm' (that is, followed by number 5 between parentheses) for OIDs that commence with {itu-r(0) r-recommendation(5)} (see Rec. ITU-T X.680 | ISO/IEC 9834-1, clause A.5, for more details on this specific case). Consequently Unicode label ITU-R can only be used for "OID-IRIs" that designate OIDs under the {itu-r(0) r-recommendation(5)} arc.
All decisions related to subsequent arcs, other than the assignment of additional secondary identifiers to top-level arc 0 (see Rec. ITU-T X.660 | ISO/IEC 9834-1, clause A.5), will be recorded ad amendments to Rec. ITU-T X.660 | ISO/IEC 9834-1 (such changes to the joint ITU-T | ISO/IEC text will be regarded as editorial by ISO).
From Rec. ITU-T X.660 | ISO/IEC 9834-1, "the top-level arcs are restricted to three arcs numbered 0 to 2; and the arcs beneath root arcs 0 and 1 are restricted to forty arcs numbered 0 to 39. This enables optimized encodings to be used in which the values of the top two arcs for all arcs under top-level arcs 0 and 1 encode in a single octet in an object identifier encoding (see the Rec. ITU-T X.690 series | ISO/IEC 8825 multi-part Standard).
International Organization for Standardization (ISO)
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This arc is for International Standards and ISO Member Bodies.
Operation of this arc is in accordance with Rec. ITU-T X.660 | ISO/IEC 9834-1 "Procedures for the operation of object identifier registration authorities: General procedures and top arcs of the international object identifier tree".
All decisions related to subsequent arcs, other than the assignment of additional secondary identifiers to top-level arc 1 (see Rec. ITU-T X.660 (2004) | ISO/IEC 9834-1:2004, A.5), will be recorded as amendments to Rec. ITU-T X.660 | ISO/IEC 9834-1 (such changes to the common text will be regarded as editorial by ITU-T).
From Rec. ITU-T X.660 (2004) | ISO/IEC 9834-1:2004, "the top-level arcs are restricted to three arcs numbered 0 to 2; and the arcs beneath root arcs 0 and 1 are restricted to forty arcs numbered 0 to 39. This enables optimized encodings to be used in which the values of the top two arcs for all arcs under top-level arcs 0 and 1 encode in a single octet in an object identifier encoding (see the Rec. ITU-T X.690 series | ISO/IEC 8825 multi-part Standard).
Common standardization area of ISO/IEC (International Organization for Standardization/International Electrotechnical Commission) and ITU-T (International Telecommunications Union - Telecommunication standardization sector)
This OID is jointly administered by ISO and ITU-T according to Rec. ITU-T X.662 | ISO/IEC 9834-3 "Procedures for the Operation of OSI Registration Authorities: Registration of Object Identifier Arcs for Joint ISO and ITU-T Work". As a consequence, all requests for registration must be jointly approved by ITU-T Study Group 17 and ISO/IEC JTC 1/SC 6. Child OIDs are recorded in the Register of arcs beneath the root arc with primary integer value 2.
New child OIDs will be allocated a number greater than 47, except if there is a good rationale that a compact binary encoding is needed, in which case a number less or equal to 47 can be allocated so that the OID encodes with a single octet.
Where the data comes from
168 source collections
Each OID is counted once per source. The same OID can appear in several sources, so the rows do not add up to the database total. File references include repeated mentions across different files.
OID and reference counts exclude inactive or quarantined evidence. Files include retained versions, counted within each source collection. Some historical OID records have no linked source file.
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