# IDs and Test Data


UUIDs, ULIDs, generated MAC addresses, and safe fake identifiers for tests and examples.

This guide is the canonical guide page for related tools on ilham.dev. It should grow into practical explanations, caveats, examples, and references instead of creating one thin article per utility.

## Related tools

- [ULID Generator](/tools/ulid-generator/) — Generate sortable ULIDs, single or in bulk.
- [UUID Generator](/tools/uuid-generator/) — Generate v4 UUIDs, single or in bulk.

## Notes for future edits

- Keep the guide reusable and factual.
- Link to personal posts only when there is a real incident, measurement, migration, or lesson.
- For sensitive inputs, mention whether the related tool runs locally in the browser and warn against pasting production secrets without understanding the trust boundary.