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RFC 9562: Universally Unique IDentifiers (May 2024)
This specification defines UUIDs (Universally Unique IDentifiers) -- also known as GUIDs (Globally Unique IDentifiers) -- and a Uniform Resource Name namespace for UUIDs. A UUID is 128 bits long and is intended to guarantee uniqueness across space and time. UUIDs were originally used in the Apollo Network Computing System (NCS), later in the Open Software Foundation's (OSF's) Distributed Computing Environment (DCE), and then in Microsoft Windows platforms. This specification is derived from the OSF DCE specification with the kind permission of the OSF (now known as "The Open Group"). Information from earlier versions of the OSF DCE specification have been incorporated into this document. This document obsoletes RFC 4122.
When in use with URNs or as text in applications, any given UUID should be represented by the "hex-and-dash" string format consisting of multiple groups of uppercase or lowercase alphanumeric hexadecimal characters separated by single dashes/hyphens. UUIDv7 features a time-ordered value field derived from the widely implemented and well-known Unix Epoch timestamp source, the number of milliseconds since midnight 1 Jan 1970 UTC, leap seconds excluded. It should be noted that, although this section details two methods for the sake of completeness, implementations should utilize the pseudorandom Node ID option if additional collision resistance for distributed UUID generation is a requirement.
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