Universally Unique IDentifiers (UUIDs)

Metadata

Publisher: IETF
Doc Type: Standard
Pages: 46
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.
Publication Date: 2024-05-01
Status Note: Proposed Standard
DOI: 10.17487/RFC9562
Link: https://doi.org/10.17487/RFC9562
Author(s): Kyzer R. Davis
Brad Peabody
P. Leach
Keyword(s): UUID

Latest version of IETF RFC 9562

Document Versions — IETF RFC 9562

▶ IETF RFC 9562 (2024-05-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

ISBN.1859120415 — 2 EXTERNAL
NIST FIPS 180-4 [Active]
NIST.FIPS.202 — FIPS202 EXTERNAL
The Open Group, "DCE 1.1: Authentication and Security Services", Open Group CAE Specification C311, August 1997, <https://pubs.opengroup.org/onlinepubs/9696989899/toc.pdf>. EXTERNAL
IETF RFC 2119 [Active*]
IETF RFC 8141 [Active*]
IETF RFC 8174 [Active*]
T-REC-X.667.2004 — X667 EXTERNAL

Bibliographic Reference(s)

10.1109-IEEESTD.2019.8766229 — IEEE754 EXTERNAL
GITHUB.boundary.flake — Flake EXTERNAL
GITHUB.chilts.sid — SID EXTERNAL
GITHUB.ericelliott.cuid — CUID EXTERNAL
GITHUB.ppearcy.elasticflake — Elasticflake EXTERNAL
GITHUB.richardtallent.RT.Comb — COMBGUID EXTERNAL
GITHUB.rs.xid — XID EXTERNAL
GITHUB.segmentio.ksuid — KSUID EXTERNAL
GITHUB.sony.sonyflake — Sonyflake EXTERNAL
GITHUB.T-PWK.flake-idgen — FlakeID EXTERNAL
GITHUB.twitter-archive.cassie — LexicalUUID EXTERNAL
GITHUB.twitter-archive.snowflake — Snowflake EXTERNAL
GITHUB.ulid.spec — ULID EXTERNAL
ISBN.9781504495202 — IEEE802.11bh EXTERNAL
MongoDB, "ObjectId", <https://docs.mongodb.com/manual/reference/method/ObjectId/>. EXTERNAL
Cabrera, I. B., "Laravel: The mysterious "Ordered UUID"", January 2020, <https://itnext.io/laravel-the-mysterious-ordered-uuid-29e7500b4f8>. EXTERNAL
Lehenbauer, M., "The 2^120 Ways to Ensure Unique Identifiers", February 2015, <https://firebase.googleblog.com/2015/02/the-2120-ways-to-ensure-unique_68.html>. EXTERNAL
IBM, "uuid_gen Command (NCS)", March 2023, <https://www.ibm.com/docs/en/aix/7.1?topic=u-uuid-gen-command-ncs>. EXTERNAL
IANA, "Uniform Resource Names (URN) Namespaces", <https://www.iana.org/assignments/urn-namespaces/>. EXTERNAL
Microsoft, "2.3.4.3 GUID - Curly Braced String Representation", April 2023, <https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-dtyp/222af2d3-5c00-4899-bc87-ed4c6515e80d>. EXTERNAL
Chen, R., "Why does COM express GUIDs in a mix of big-endian and little-endian? Why can't it just pick a side and stick with it?", September 2022, <https://devblogs.microsoft.com/oldnewthing/20220928-00/?p=107221>. EXTERNAL
Occil, P., "Random Number Generator Recommendations for Applications", June 2023, <https://peteroupc.github.io/random.html>. EXTERNAL
Instagram Engineering, "Sharding & IDs at Instagram", December 2012, <https://instagram-engineering.com/sharding-ids-at-instagram-1cf5a71e5a5c>. EXTERNAL
IETF RFC 1321 [Active*]
IETF RFC 1738 [Superseded*]
IETF RFC 4086 [Active*]
IETF RFC 4122 [Superseded*]
IETF RFC 5234 [Active, Amended*]
IETF RFC 6151 [Active*]
IETF RFC 6194 [Active*]
IETF RFC 8126 [Active*]
RFC8937 — RFC8937 EXTERNAL
IETF RFC 9499 [Active*]
IETF RFC 9542 [Active*]
T-REC-X.500.2019 — X500 EXTERNAL
T-REC-X.660.2011 — ITU-T-X.660 EXTERNAL
T-REC-X.680.2021 — ASN.1 EXTERNAL

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Referenced By

IETF RFC 9725 [Active*]
IETF RFC 9911 [Active*]