UUID Examples
Version 4 (Random)
Completely random UUID based on random or pseudo-random numbers.
Version 1 (Timestamp)
Based on timestamp and MAC address (or random node).
Keyboard Shortcuts
About UUIDs
What are UUIDs?
Universally Unique Identifiers are 128-bit numbers used to uniquely identify information in computer systems without central coordination.
Version 4 (Random)
Generated using random or pseudo-random numbers. Most commonly used version with extremely low probability of duplicates.
Version 1 (Timestamp)
Based on timestamp and MAC address. Guarantees uniqueness but may reveal information about when and where it was generated.
Use Cases
Database primary keys, session IDs, transaction IDs, file names, API keys, and any scenario requiring unique identifiers.
Security
UUIDs are not cryptographically secure for sensitive applications. Use proper encryption for security-critical scenarios.
Standards
UUIDs follow RFC 4122 standard ensuring compatibility across different systems and programming languages worldwide.