Generated UUIDs5
98635487-a42c-4f6c-9305-61946e468095
0dc24c51-b5dd-4910-a22d-e97388aae29f
51fdc4aa-a3c0-43b7-8583-80a94e31ac49
3083253f-cd4c-4f2c-89ac-d3665b31622d
aed355fd-2253-4b24-b6e3-2c8a9524540d
What is a UUID?
A UUID (Universally Unique Identifier) is a 128-bit label used to uniquely identify information. The standard format is xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx — 32 hex digits split into 5 groups. Defined in RFC 4122.
UUID v4
Version 4 UUIDs are randomly generated. The 13th character is always 4 (version) and the 17th is 8, 9, a, or b (variant). The remaining 122 bits are random.
Common Uses
- Primary keys in databases
- Session and request identifiers
- File names to avoid collisions
- Idempotency keys for APIs
- Need non-UUID random strings? Try the Random String Generator
- Read more: UUID v4, ULID, and NanoID comparison