Shape, check digit, accepted and refused examples and the API call for Organisasjonsnummer in Norway. Every example on this page is run through the same validators as the free identifier validator, so a value shown as accepted is a value the validator accepts.
| Field | Value |
|---|---|
| Register | Brønnøysundregistrene |
| Shape | N{8} C |
| Check digit | Enforced. Weights 3,2,7,6,5,4,3,2 over the first 8 digits; check = 11 minus the sum mod 11 (0 when the remainder is 0). A result of 10 is never issued. |
| Worked example (accepted) | 923609016 |
| Normalised form | 923609016 |
| Also accepted as input | 923 609 016 |
| A one-character slip | 923609017 is refused |
| Regex (normalised form) | ^[0-9]{9}$ |
| API call | GET /companies/search?country=NO&company_number=923609016 |
| VAT number | NO + number + MVA — published or confirmed by the register |
Sole proprietorships (ENK) are included as the register publishes them.
curl "https://api.prometiam.com/functions/v1/risk-api/companies/search?country=NO&company_number=923609016" \ -H "Authorization: Bearer YOUR_API_KEY"
Shape notation: N digit · L letter · X digit or letter · C check digit or character · {n} repeat n times.
A valid shape and check digit prove that a number is well-formed, not that a company holds it. Only a lookup in the register answers that.
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