Universally Unique IDentifiers
RFC 9562, “Universally Unique IDentifiers”, is a Proposed Standard document published in May 2024 by K. Davis, B. Peabody, P. Leach. It obsoletes RFC 4122. The canonical text is published by the RFC Editor.
Abstract
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.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9562 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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