Learn How UUIDs Are Structured
See the version, variant, and time fields that make up a UUID.
💡 Versions 1, 6, and 7 (and ULIDs) embed a creation time, which is decoded above. Versions 4 are fully random and carry no timestamp. Everything is parsed in your browser.
learning tips
Try the built-in examples to see how each UUID version differs in structure.
The breakdown shows which bits carry the version, variant, timestamp, and node.
A practical way to understand RFC 4122 / RFC 9562 without reading the spec.
No data is uploaded — experiment freely.
工作原理
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Also check out…
Check a UUID Version
Find out whether a UUID is v1, v4, v7, or another
Extract the Timestamp from a UUIDv7
Decode the creation time embedded in a sortable UU
Decode a ULID
Read the timestamp and randomness from a ULID.
Debug IDs in Logs and Databases
Quickly understand an unfamiliar identifier you fo