SIRET Checker User Guide – Easily Verify French Business Establishment Codes

What is a SIRET Number?

SIRET (Système d'Identification du Répertoire des Etablissements) is a 14-digit code assigned by INSEE, the French national statistics office, to uniquely identify each physical location of a business (headquarters, factories, stores, etc.). It consists of a 9-digit SIREN (unique legal entity identifier) and a 5-digit NIC (internal classification code). The last digit is a Luhn checksum to detect input errors.

How to Use This SIRET Checker?

1. Enter a 14-digit number (non-digits are automatically removed).
2. Click Validate, and the backend will verify the length, SIREN part validity, and Luhn checksum.
3. Check the result.

This tool is completely free and suitable for business managers, accountants, and commercial information seekers.

Frequently Asked Questions

1. Does SIRET validation guarantee that the establishment actually exists?

This tool validates the format and checksum. If it shows "valid", it means the number is structurally correct. Actual existence must be verified through INSEE's official database or French business directories.

2. What's the difference between SIRET and SIREN?

SIREN identifies the legal entity (9 digits), each business has only one SIREN; SIRET identifies a specific physical address (14 digits), a business can have multiple SIRETs.

3. Why does it show invalid?

Possible reasons: length not 14 digits; contains non-digit characters; checksum mismatch (Luhn algorithm).

If you have other questions, feel free to give feedback. Thanks for using!