Generate a test Japan My Number (Individual Number)
A Japanese My Number is a twelve-digit individual number with a MOD-11 check digit. These test values are synthetic but checksum-valid.
Synthetic · not collision-guaranteed Validate a number →
6059 9267 4945
Synthetic My Number with a valid check digit. Not a real issued number.
Format specification
| Identifier | My Number (Individual Number) |
|---|---|
| Country | 🇯🇵 Japan |
| Format | 0000 0000 0000 |
| Length | 12 characters |
| Checksum | MOD 11 |
| Example | 7291 3633 5391 |
| Safe strategy | Synthetic |
| Data quality | Verified against sources |
Validation regex
Matches the canonical value — strip separators and uppercase first: value.replace(/[^A-Za-z0-9]/g, '').toUpperCase()
^\d{12}$ References
Common questions
Will these pass my validation?
Yes — they are well-formed My Number (Individual Number) values (0000 0000 0000) and pass standard format checks, including the MOD 11 checksum.
Could one belong to a real person?
These are synthetic values. They are format-valid but not drawn from a guaranteed reserved range, so use them only for testing.
Can I generate many at once?
Increase the count, or use the free API and CSV/JSON export for large datasets.
For software testing only. These numbers are synthetic and must never be used
for real-world identification, applications, or to impersonate anyone.