Shape, check digit, accepted and refused examples and the API call for Enterprise number in Belgium. 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 | KBO / BCE |
| Shape | N{8} C{2} |
| Check digit | Enforced. 10 digits starting with 0 or 1; the last two are 97 minus the first eight digits mod 97. |
| Worked example (accepted) | 0417.497.106 |
| Normalised form | 0417.497.106 |
| Also accepted as input | 0417497106 · 417497106 |
| A one-character slip | 0417.497.107 is refused |
| Regex (normalised form) | ^[01][0-9]{3}\.[0-9]{3}\.[0-9]{3}$ |
| API call | GET /companies/search?country=BE&company_number=0417.497.106 |
| VAT number | BE + the 10 digits — published or confirmed by the register |
Written 0NNN.NNN.NNN; dots and spaces are optional and a dropped leading zero is restored. Enterprises of natural persons are never served.
curl "https://api.prometiam.com/functions/v1/risk-api/companies/search?country=BE&company_number=0417.497.106" \ -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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