UUIDTools.com

Version 2 UUID Generator (DCE Security)

DCE Security. Legacy, rarely used; embeds a local user/group id.

Decode
Options & format

Formatting is applied instantly in your browser. A GUID is a UUID: tick Uppercase + Braces for the Microsoft registry style.

API
http://uuidtools.com/api/generate/v2

Plain-text and JSON API docs: no key required.

About Version 2 UUIDs

Version 2 UUIDs ("DCE Security") replace part of a version 1 UUID with a local identifier such as a POSIX user or group ID, and a domain identifying what kind of ID it is. RFC 9562 reserves the version but does not define it; the layout comes from the DCE 1.1 specification.

They are rare and lose timestamp precision, so almost nobody needs them. We provide the generator for completeness.

When to use it

  • Interoperating with DCE-era systems.

When to avoid it

  • Everything else. Use v7 (time-ordered) or v4 (random).