RFC 9562 also defines a max UUID of all 1-bits. Rare in the wild.

Nil UUID

What this is

RFC 4122 defines a nil UUID of all zeros. APIs use it as 'unset'. Never generate nil as a real entity id — uniqueness is zero, and some ORMs treat it as NULL.

Open the generator — v4, v7, and v5 in this tab.

00000000-0000-0000-0000-000000000000

FAQ

Max UUID?: RFC 9562 also defines a max UUID of all 1-bits. Rare in the wild.

UUID v4
UUID v7
UUID v5
GUID vs UUID
Validate a UUID
UUID vs NanoID

What this is

FAQ

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