Timestamp Converter

UUID Decoder

Decode any UUID to see its version, variant, and embedded timestamp. Supports versions 1 through 7.

UUID

paste a UUID to decode it

UUID Versions

v1
Date-Time + MAC

Timestamp (100-ns intervals since 1582-10-15) and node (MAC address). Sortable by time but leaks the host MAC.

v3
Name-Based (MD5)

Deterministic hash of a namespace UUID + name using MD5. Same input always produces the same UUID.

v4
Random

122 bits of cryptographic randomness. The most commonly used version today. No embedded timestamp or node.

v5
Name-Based (SHA-1)

Same concept as v3 but uses SHA-1 instead of MD5. Preferred over v3 for new systems.

v6
Reordered Time (RFC 9562)

Same timestamp as v1 but with the bits reordered for natural lexicographic sorting. Also includes clock sequence and node.

v7
Unix Epoch Time (RFC 9562)

48-bit Unix timestamp in milliseconds plus random bits. Sortable, no MAC leak, and the recommended choice for new systems.