How to use
- Paste the value into the validation field.
- Review format and check-digit feedback.
- Fix the input if needed — nothing is sent to a server.
What it's for
Validate Belgian national number check digits.
About the document
The Belgian national number (rijksregisternummer) has 11 digits with a modulo-97 check.
Also useful
Need an example? Try the national number generator.
Veelgestelde vragen
- Does this query official databases?
- No. Validation is algorithmic and local only.
- Does data leave my browser?
- No. Everything runs locally on your device.