Version1 Date-time and MAC address.

Version2 Date-time and MAC address, DCE security version.

Version3 Namespace name-based (MD5).

Version4 Random UUID.

Version5 Namespace name-based (SHA1).

Version6 UUIDv6 is a field-compatible version of UUIDv1.

Version7 UUIDv7 features a time-ordered value field derived from the widely implemented and well-known Unix Epoch timestamp source, the number of milliseconds since midnight 1 Jan 1970 UTC, leap seconds excluded.

Version8 UUIDv8 provides a format for experimental or vendor-specific use cases.