The Nil UUID has all 128 bits set to 0: 00000000-0000-0000-0000-000000000000.
This is not a valid UUID.
Enter year-month-day and a 24-hour time, in your local time. Leave empty to use the current time.
Enter a date and time like 2026-10-29 14:30.
32 hex digits, hyphens allowed. Version and variant bits are set for you. Empty means random.
Enter exactly 32 hex digits (0-9, a-f).
Generated UUID
00000000-0000-0000-0000-000000000000
Created in your browser. Nothing is sent to a server.
A URN always has hyphens.
Enter a whole number from 1 to 1,000.
RFC 9562 defines it as a special value. It has no version and no variant, and it is never created by chance.
Use it as a placeholder for “no UUID yet” or “not set”, for example as a default value. Some databases and APIs treat it like an empty value.