Question 1

What is a UUID?

Accepted Answer

A UUID (Universally Unique Identifier) is a 128-bit identifier formatted as 32 hexadecimal digits in the pattern xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. UUID v4 is randomly generated and the probability of collision is astronomically low.

Question 2

Is UUID v4 truly unique?

Accepted Answer

UUID v4 generates 122 random bits. With 1 billion UUIDs generated per second, you would need 86 years to have a 50% chance of a single collision. For practical purposes, treat them as unique.

Question 3

What are UUIDs used for?

Accepted Answer

UUIDs are used as primary keys in databases, identifiers for distributed systems, session tokens, file names, and anywhere a unique ID is needed without a central authority.

UUID Generator

Generate Single UUID

Bulk Generation

Frequently Asked Questions

UUID Generator

Generate Single UUID

Bulk Generation

Frequently Asked Questions

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