Security
UUID Generator
Generate UUIDs (Universally Unique Identifiers) in various formats
Random UUID
Generated UUIDs (1)
c2415a76-dbd6-4378-b5bc-1ddfa5b4372dUUID Versions
UUID v1
Timestamp-based UUIDs that include MAC address and time information.
UUID v2 (DCE Security)
Similar to v1 but includes POSIX UID/GID. Rarely used in practice.
UUID v3
MD5 hash of namespace and name. Deterministic - same input always produces same UUID.
UUID v4
Random UUIDs with 122 bits of randomness. Most commonly used version.
UUID v5
SHA-1 hash of namespace and name. Preferred over v3 for better collision resistance.
UUID v6 (Draft)
Reordered timestamp version. Like v1 but with better database sorting properties.
UUID v7
Time-ordered UUIDs with millisecond precision and random data. Best for database keys.
UUID v8 (Custom)
Experimental version for custom/vendor-specific implementations. Allows arbitrary data.