A Universally Unique IDentifier (UUID) URN Namespace
RFC 4122
| Document | Type |
RFC - Proposed Standard
(July 2005; Errata)
Was draft-mealling-uuid-urn (individual in app area)
|
|
|---|---|---|---|
| Last updated | 2013-03-02 | ||
| Stream | IETF | ||
| Formats | plain text pdf html bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 4122 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Ted Hardie | ||
| Send notices to | (None) | ||
Network Working Group P. Leach
Request for Comments: 4122 Microsoft
Category: Standards Track M. Mealling
Refactored Networks, LLC
R. Salz
DataPower Technology, Inc.
July 2005
A Universally Unique IDentifier (UUID) URN Namespace
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2005).
Abstract
This specification defines a Uniform Resource Name namespace for
UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally
Unique IDentifier). A UUID is 128 bits long, and can guarantee
uniqueness across space and time. UUIDs were originally used in the
Apollo Network Computing System and later in the Open Software
Foundation's (OSF) Distributed Computing Environment (DCE), and then
in Microsoft Windows platforms.
This specification is derived from the DCE specification with the
kind permission of the OSF (now known as The Open Group).
Information from earlier versions of the DCE specification have been
incorporated into this document.
Leach, et al. Standards Track [Page 1]
RFC 4122 A UUID URN Namespace July 2005
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Namespace Registration Template . . . . . . . . . . . . . . . 3
4. Specification . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1. Format. . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.1.1. Variant. . . . . . . . . . . . . . . . . . . . . . 6
4.1.2. Layout and Byte Order. . . . . . . . . . . . . . . 6
4.1.3. Version. . . . . . . . . . . . . . . . . . . . . . 7
4.1.4. Timestamp. . . . . . . . . . . . . . . . . . . . . 8
4.1.5. Clock Sequence . . . . . . . . . . . . . . . . . . 8
4.1.6. Node . . . . . . . . . . . . . . . . . . . . . . . 9
4.1.7. Nil UUID . . . . . . . . . . . . . . . . . . . . . 9
4.2. Algorithms for Creating a Time-Based UUID . . . . . . . . 9
4.2.1. Basic Algorithm. . . . . . . . . . . . . . . . . . 10
4.2.2. Generation Details . . . . . . . . . . . . . . . . 12
4.3. Algorithm for Creating a Name-Based UUID. . . . . . . . . 13
4.4. Algorithms for Creating a UUID from Truly Random or
Pseudo-Random Numbers . . . . . . . . . . . . . . . . . . 14
4.5. Node IDs that Do Not Identify the Host. . . . . . . . . . 15
5. Community Considerations . . . . . . . . . . . . . . . . . . . 15
6. Security Considerations . . . . . . . . . . . . . . . . . . . 16
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 16
8. Normative References . . . . . . . . . . . . . . . . . . . . . 16
A. Appendix A - Sample Implementation . . . . . . . . . . . . . . 18
B. Appendix B - Sample Output of utest . . . . . . . . . . . . . 29
C. Appendix C - Some Name Space IDs . . . . . . . . . . . . . . . 30
1. Introduction
This specification defines a Uniform Resource Name namespace for
UUIDs (Universally Unique IDentifier), also known as GUIDs (Globally
Unique IDentifier). A UUID is 128 bits long, and requires no central
registration process.
The information here is meant to be a concise guide for those wishing
to implement services using UUIDs as URNs. Nothing in this document
should be construed to override the DCE standards that defined UUIDs.
There is an ITU-T Recommendation and ISO/IEC Standard [3] that are
derived from earlier versions of this document. Both sets of
specifications have been aligned, and are fully technically
compatible. In addition, a global registration function is being
provided by the Telecommunications Standardisation Bureau of ITU-T;
for details see <http://www.itu.int/ITU-T/asn1/uuid.html>.
Leach, et al. Standards Track [Page 2]
RFC 4122 A UUID URN Namespace July 2005
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