Nil UUID

The special zero UUID

Nil UUID

00000000-0000-0000-0000-000000000000

What is a Nil/Empty UUID?

The nil UUID is a special form of UUID with all 128 bits set to zero. It's used to represent the absence of a UUID value.

Format

8-4-4-4-12

Value

All Zeros

Common Uses

• Default/uninitialized UUID values
• Placeholder in database schemas
• Null object pattern implementation
• Testing and development

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UUIDs conform to RFC 4122. Learn more at Wikipedia.