How the common UUID versions are generated. For the full explanation, see What Is a UUID?.
| Version | How It’s Generated |
|---|---|
| v1 | Based on a timestamp and the generating device’s MAC address |
| v3 | Name-based, using an MD5 hash of a namespace and name |
| v4 | Randomly generated |
| v5 | Name-based, using a SHA-1 hash of a namespace and name |
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Version 4 (random), since it doesn’t require any coordination and doesn’t leak identifying information like a MAC address.
Theoretically yes, but the probability for v4 UUIDs is astronomically small, effectively negligible for practical purposes.
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