RFC 4122 - A Universally Unique IDentifier (UUID) URN Namespace
- Status: Proposed Standard
- Published: July 2005
- Stream: IETF
- Obsoleted by: RFC9562
- Errata: No Errata
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.
Table of Contents
- 1. Introduction
- 2. Motivation
- 3. Namespace Registration Template
- 4. Specification
- 4.1. Format
- 4.2. Algorithms for Creating a Time-Based UUID
- 4.3. Algorithm for Creating a Name-Based UUID
- 4.4. Algorithms for Creating a UUID from Truly Random or Pseudo-Random Numbers
- 4.5. Node IDs that Do Not Identify the Host
- 5. Community Considerations
- 6. Security Considerations
- 7. Acknowledgments
- 8. Normative References
Appendices
- Appendix A. Sample Implementation
- Appendix B. Sample Output of utest
- Appendix C. Some Name Space IDs
Related Resources
- Official Text: RFC 4122
- Official Page: RFC 4122 DataTracker
- Errata: RFC Editor Errata