Document Type Expired Internet-Draft (individual)
Last updated 1998-02-05
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This specification defines the format of UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally Unique IDentifier). A UUID is 128 bits long, and if generated according to the one of the mechanisms in this document, is either guaranteed to be different from all other UUIDs/GUIDs generated until 3400 A.D. or extremely likely to be different (depending on the mechanism chosen). UUIDs were originally used in the Network Computing System (NCS) [1] and later in the Open Software Foundation's (OSF) Distributed Computing Environment [2]. This specification is derived from the latter specification with the kind permission of the OSF.


Paul Leach (paulle@microsoft.com)
Rich Salz (rsalz@osf.org)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)