UUID fields and text
01A UUID is 128 bits, commonly written in five hexadecimal groups.
Related RFCs and changes
“Updates” changes part of an earlier RFC. “Obsoletes” replaces it. This list shows selected related documents.
DIAGRAM§ 4 ↗
RFC 9562 · § 4EXAMPLE
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03
Interpret 128 bits
Hyphens are presentation separators, not extra identifier bits.
Protocol participantThreat or exceptionProtocol controlSimplified drawings · precise section references
RFC 4122 versions 1–5RFC 9562 §§5.6–5.8
This revision defines time-ordered versions 6 and 7 and custom version 8, alongside revised generation guidance.
Read the updated RFC section ↗The standard text form has groups of 8-4-4-4-12 hexadecimal digits.
- The standard text form has groups of 8-4-4-4-12 hexadecimal digits.
- Version and variant bits identify the applicable layout.
- A syntactically valid identifier does not authenticate its creator.
Examples are illustrative. Consult the linked RFC and its errata for implementation details.
Read the RFC section ↗Diagrams simplify the RFC. Read the linked sections for complete requirements.
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