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UUID
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uuid.md

UUID

ULIDs and Primary Keys | Dave Allie

UUIDv4

When people say UUID they're almost always referring to UUIDv4. It's the most prevalent and widely supported UUID standard, even the example UUID given above is a UUIDv4. As UUIDv4 is based solely on randomness, it is extremely portable and can be used with very little prior knowledge about the state of the system.

UUIDv4 are composed of 122 bits of randomness, and 6 bits of version/variant identification.

RFC 4122 - A Universally Unique IDentifier (UUID) URN Namespace

Construction Quality Management Software - Visibuild

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