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The concept of "class" of an OID is not standardized in Recommendation ITU-T X.660 | ISO/IEC 9834-1. It is introduced in this OID repository to better understand what is referenced by each OID.
The following classes are used in the OID repository:
- Individuals;
- Companies;
- Countries;
- All sorts of entities (e.g. organizations, administrations, groups, etc.);
- Standards development organizations (SDOs) and their working groups;
- Standards (e.g. ISO or IEC international standards, ITU-T and ITU-R Recommendations, other standards);
- Products;
- Management Information Base (MIB) objects for network management;
- Policy Information Base (PIB) objects for policy decisions;
- Objects in GDMO (Guidelines for the Definition of Managed Objects) notation for network management;
- Message handling systems conforming to the Rec. ITU-T X.400 | ISO/IEC 10021 series of standards;
- Objects for a Directory application conforming to the Rec. ITU-T X.500 | ISO/IEC 9594 series of standards;
- Certificates, certification authorities, etc., used in a Public Key Infrastructure (PKI) conforming to Rec. ITU-T X.509 | ISO/IEC 9594-8;
- Lightweight Directory Access Protocol (LDAP) elements;
- ASN.1 elements (e.g. types, information objects, encoding rules);
- ASN.1 modules;
- Modules in other languages than ASN.1 (note: it denotes a Simple Network Management Protocol (SNMP)
MODULE-IDENTITY when used together with class "Management Information Base (MIB)");
- Algorithms (including cryptographic algorithms);
- Healthcare (including objects registered in the HL7 OID registry);
- Space data systems (including objects registered in the Space Assigned Numbers Authority (SANA) registries);
- Registration authorities allocating OIDs;
- Identification schemes;
- Temporary objects (may be used together with another class);
- Testing (may be used together with another class);
- Examples (may be used together with another class);
- Deprecated (or obsolete) OIDs (may be used together with another class).
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