UUID Validator

Check whether a UUID is valid and identify its version.

UUID (or one per line)

Braced {…} and urn:uuid: forms are accepted and normalised.

Result

Valid UUID

018f4e2a-7c3b-7d91-a4e5-2b8c9d0f1a3e

Version

Variant

RFC 9562 (variant 1)

Special form

Standard

Embedded timestamp

6 May 2024, 13:49:18

Version 7 UUIDs encode their creation time

What does UUID Validator do?

Validate a UUID against RFC 9562, identify its version and variant, and — for version 7 — extract the embedded timestamp. Also accepts the braced and URN forms other systems produce.

How to Use UUID Validator

1
Paste a UUIDOr a list, one per line.
2
Read the verdictValid or not, with the version and variant.
3
Check the detailsVersion 7 UUIDs also show their creation time.

Key Features

Format validation against the canonical 8-4-4-4-12 form
Version and variant identification
Timestamp extraction for version 7 UUIDs
Recognises nil and max UUIDs
Accepts braced {…} and urn:uuid: forms and normalises them
Validate a whole list at once

Frequently Asked Questions

What makes a UUID valid?

32 hexadecimal digits in the pattern 8-4-4-4-12, with the version in the first digit of the third group and the variant in the first digit of the fourth. Case does not matter.

How do I tell which version a UUID is?

The 13th hex digit — the first character of the third group. A 4 there means version 4 (random), a 7 means version 7 (time-ordered), a 1 means version 1 (timestamp plus MAC address).

Are UUID and GUID the same thing?

Effectively yes. GUID is Microsoft’s name for the same 128-bit identifier. Microsoft tooling often wraps it in braces, which this validator accepts and strips.

What is the nil UUID?

All zeros — a defined sentinel meaning "no value". There is also a max UUID of all fs. Both are recognised and reported separately, since neither carries a version.