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UUID vs ULID vs Random IDs: Sorting, Privacy, Collisions and Parsing Mistakes in Python

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Self-Hosting & Infra intermediate 5 min read $0.01 Updated 2026-10-20

Executed in Python 3.10: uuid4 length, version and sort order, uuid1 node exposure, ulid-py ordering within and across milliseconds, UUID parsing forms and errors, deterministic uuid5, and secrets token sizes.

Choose identifiers for databases and APIs: uuid4 is random and unsorted, uuid1 leaks the machine, ULIDs sort by time but not strictly within a millisecond, and uuid5 is deterministic. See each behavior and when to use which.

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