Shape, check digit, accepted and refused examples and the API call for Company number in United Kingdom. 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 | Companies House |
| Shape | N{8} | L{2} N{6} |
| Check digit | None: the shape is the only test. No check digit: 8 digits, or 2 letters and 6 digits. The shape is the only test. |
| Worked example (accepted) | 00445790 |
| Normalised form | 00445790 |
| Also accepted as input | SC095237 |
| Regex (normalised form) | ^([0-9]{8}|[A-Z]{2}[0-9]{6})$ |
| API call | GET /companies/search?country=GB&company_number=00445790 |
| VAT number | The register data holds no VAT number for this identifier. |
The prefix names the type: SC Scotland, NI Northern Ireland, OC, SO and NC limited liability partnerships, FC overseas companies. A well-formed number does not prove the company exists.
curl "https://api.prometiam.com/functions/v1/risk-api/companies/search?country=GB&company_number=00445790" \ -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.
Register data that the API serves for United Kingdom carries this credit:
Contains public sector information licensed under the Open Government Licence v3.0. Source: Companies House, UK.
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