Database Primary Keys: Unique identifiers for records across distributed systems API Request IDs: Tracking requests for debugging and logging File Names: Generating unique filenames to prevent conflicts Session IDs: Identifying user sessions securely Message IDs: Unique identifiers for messages in queuing systems Minecraft Bedrock Packs: Pack/module identification in manifest.json for resource packs, skin packs, and behavior packs

Version 1: Based on MAC address + timestamp. Predictable but traceable. Version 4: Completely random. Most secure and widely used. Version 5: Based on SHA-1 hash of namespace + name. Deterministic. Version 6: Reordered timestamp for better database sorting. Version 7: Unix timestamp-based for time-ordered sequences. Special Types: Null UUID (00000000-0000-0000-0000-000000000000), Max UUID (FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF) for testing and placeholders. Recommendation: Use Version 4 for mo...

UUID Generator

Generate unique identifiers for your applications, databases, and APIs.

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Examples & References

Common Use Cases

Database Primary Keys: Unique identifiers for records across distributed systems
API Request IDs: Tracking requests for debugging and logging
File Names: Generating unique filenames to prevent conflicts
Session IDs: Identifying user sessions securely
Message IDs: Unique identifiers for messages in queuing systems
Minecraft Bedrock Packs: Pack/module identification in manifest.json for resource packs, skin packs, and behavior packs

Version Comparison

Version 1: Based on MAC address + timestamp. Predictable but traceable.
Version 4: Completely random. Most secure and widely used.
Version 5: Based on SHA-1 hash of namespace + name. Deterministic.
Version 6: Reordered timestamp for better database sorting.
Version 7: Unix timestamp-based for time-ordered sequences.
Special Types: Null UUID (00000000-0000-0000-0000-000000000000), Max UUID (FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF) for testing and placeholders.

Recommendation: Use Version 4 for most applications unless you need specific timestamp ordering.