UUID Generator (v4)
Quickly generate cryptographically strong version 4 UUIDs.
What is a UUID?
A Universally Unique Identifier (UUID) is a 128-bit number used to identify information in computer systems. While the probability of a UUID being duplicated is not zero, it is so close to zero as to be negligible.
Understanding UUID v4
Version 4 UUIDs are completely random. Unlike other versions which might use timestamps or hardware MAC addresses, v4 relies on random numbers. Out of 128 bits, 6 bits are used to indicate the version and variant, leaving 122 bits for randomness.
Primary Benefits
- No central registration authority required
- Collision probability is effectively zero
- Safe for distributed systems
Common Usage
- Primary keys in databases
- Transaction tracking IDs
- Session identifiers in web apps