UUID Generator
Generate universally unique identifiers.
About UUIDs
A Universally Unique Identifier (UUID) is a 128-bit label used for information in computer systems. When generated according to the standard methods, UUIDs are for practical purposes unique.
Version 1 (Time-based)
Generated from a host's MAC address and the current time. Can be time-sortable but may reveal generation time and machine details.
Version 3 (Name-based, MD5)
Generated by hashing a namespace identifier and a name using MD5. Deterministic: the same inputs always produce the same UUID.
Version 4 (Random)
Generated from purely random or pseudo-random numbers. This is the most common version when uniqueness is the primary concern.
Version 5 (Name-based, SHA-1)
Similar to v3, but uses the SHA-1 hashing algorithm. Recommended over v3 due to the stronger hash function.
Nil UUID
A special UUID consisting of all zeros. It serves as a placeholder or a known "null" value.
GUID
A Globally Unique Identifier (GUID) is Microsoft's implementation of the UUID standard. It most commonly refers to a v4 UUID.