IRD Number generator (New Zealand)
A New Zealand IRD number is nine digits (an eight-digit base and a weighted MOD-11 check digit), formatted 000-000-000. These test values are synthetic but checksum-valid.
Synthetic · not collision-guaranteed Validate a number →
664-366-541
Synthetic IRD number with a valid check digit. Not a real issued number.
Format specification
| Identifier | IRD Number |
|---|---|
| Country | 🇳🇿 New Zealand |
| Format | 000-000-000 |
| Length | 9 characters |
| Checksum | Weighted MOD 11 |
| Example | 739-028-833 |
| Safe strategy | Synthetic |
| Data quality | Verified against sources |
IRD Number: what each part means
| 000-000-00 | Eight-digit base number assigned sequentially by Inland Revenue; no personal data is encoded. |
|---|---|
| 0 | Check digit: the base weighted 3,2,7,6,5,4,3,2 mod 11; if that yields 10, a secondary weight set is applied, and bases that still yield 10 are never issued. |
Validation regex
Matches the canonical value — strip separators and uppercase first: value.replace(/[^A-Za-z0-9]/g, '').toUpperCase()
^\d{9}$ References
Common questions
Will these pass my validation?
Yes — they are well-formed IRD Number values (000-000-000) and pass standard format checks, including the Weighted 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.