UUID Validator
Validate UUID format and detect version (v1–v5), variant, and URN representation.
A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 8-4-4-4-12 hexadecimal digits. The version nibble (first digit of the third group) identifies how the UUID was generated: v1 is time-based, v2 is DCE Security, v3 uses MD5 hashing, v4 is randomly generated, and v5 uses SHA-1 hashing. The variant bits (in the fourth group) indicate the UUID standard in use — most modern UUIDs use the RFC 4122 variant (binary 10xx).
Frequently Asked Questions
- Standard 8-4-4-4-12 hex format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Both uppercase and lowercase are accepted.
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