Tree display (walk down the tree by folding/unfolding nodes in an explorer)

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Many standards define certain objects for which unambiguous identification is required. This is achieved by registration. Registration is the assignment of an object identifier (OID) to an object in a way which makes the assignment available to interested parties. It is carried out by a registration authority.

Registration can be effected by publishing in the standard the names and the corresponding definitions of object. Such a mechanism requires amendment of the standard for each registration, and hence is not appropriate in cases where the registration activity is high.
Alternatively, registration can be effected by permitting one or more organizations to act as registration authorities to perform registration on a flexible basis.

The registration tree is indeed managed in a completely decentralized way (a node gives full power to its children) and it is impossible to be exhaustive (particularly world-wide).
The registration tree is defined and managed following the ITU-T X.660 & X.670 Recommendation series (or the ISO/IEC 9834 series of International Standards).

The registered objects shall be persistent. Example of commonly registered objects are given in question 2 of the FAQ.

This OID repository is not an official Registration Authority, so any OID described in this OID repository has to be officially allocated by the Registration Authority of its parent OID. This OID repository gathers information about OIDs that has been submitted by any user of this web site.