Nil UUID Generator

The all-zero UUID — a placeholder meaning “no value”.

00000000-0000-0000-0000-000000000000

About Nil UUID

The nil UUID is simply all zeros: 00000000-0000-0000-0000-000000000000. It isn't random or unique — it's a special constant used to represent an absent or not-yet-assigned identifier, much like null. RFC 9562 also defines a “max” UUID of all ones as its counterpart.

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Other UUID versions

Version 4 UUID Generator A random 128-bit identifier — the safe default for database keys and request IDs. Version 7 UUID Generator A time-ordered UUID — a Unix-millisecond timestamp followed by random bits. Version 1 UUID Generator A time-based UUID built from a timestamp, clock sequence and node. GUID Generator A GUID is the same 128-bit value, shown in the classic uppercase braces format.

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