Generated UUIDs5
9f3f674d-29b2-452a-9e39-dca09e33f4a7
d8598d8f-16fa-482b-8f59-73b458a310a9
6db5acb2-aca7-4565-8899-bcc035b03382
5fcbc16b-5fbb-4961-8d48-a5a40d2b3461
2bd06bf5-54c1-41db-b1f5-45b097afc54d
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.
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