UUID

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File Format
Name UUID
Ontology

A UUID (universally unique identifier) is an arbitrary 128-bit identifier, and a standard set of guidelines for generating such an identifier. The goal is that each identifer will (with overwhelming probability) be unique, without need of a central authority.

Some of the bits in a UUID are obviously not random. They are used to indicate the UUID version number, etc.

The standard way to display a UUID is to use hex encoding, with four hyphens added at particular positions. It typically looks something like this:

00000000-1111-2222-3333-444444444444

See also GUID, the Microsoft version of UUID.

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