France SIRET Validator
Validate French Establishment ID
Enter a French Company Establishment ID to verify its validity.
About this Validator
This tool validates French Establishment Identification Numbers according to official format requirements.
The validator checks if a given SIRET follows the correct structure, verifies its SIREN base, and validates the Luhn check digit.
This validation only confirms if a SIRET follows the correct format. It does not verify if the number is actually registered with French authorities.
What is a French SIRET (Système d'Identification du Répertoire des Établissements)?
SIRET Structure (14 digits): • First 9 digits: SIREN number • Last 5 digits: NIC (Numéro Interne de Classement) - Identifies specific establishment - Last digit is Luhn check digit • Each company establishment has unique NIC
Validation Features: • SIREN base verification • NIC format validation • Luhn algorithm check • Pattern verification • Special case handling (La Poste)
Used for: • Establishment identification • Tax reporting • Social security • Official documents • Business contracts • Location tracking
Technical Notes: • SIREN + NIC format • Luhn modulus 10 check • All digits numeric • Unique per location • INSEE database linked
If you need to generate a SIRET for testing purposes, here is a French SIRET Generator