SIREN / SIRET Validator

Check the key of a SIREN (company) or a SIRET (establishment) right in the browser. These are the pivotal party identifiers of French electronic invoicing.

SIREN (9 digits) or SIRET (14 digits)

Local check of the Luhn key (and the La Poste exception for SIRET). Registration in the SIRENE / INSEE directory is not verified.

How it works

The SIREN is a 9-digit number identifying a legal unit; the SIRET adds a 5-digit NIC (Numéro Interne de Classement) to identify a specific establishment, for 14 digits in total. The validator:

strips spaces, dots and hyphens, then checks that 9 or 14 digits remain;
verifies the Luhn key (mod 10): doubling every second digit from the right, the total must be a multiple of 10;
for a SIRET, splits it into SIREN + NIC and applies the La Poste exception.

SIREN / SIRET and e-invoicing

In the French reform, the SIREN/SIRET is the party identifier (buyer and seller) and the routing key of the central directory: it is what directs an invoice to the recipient's dematerialisation platform. It appears in the legal-registration fields of the EN 16931 formats (BT-30, BT-47) and in Factur-X.

The La Poste exception

Privacy

Limits

IBAN Validator / LEI Validator — the other identifiers of B2B exchange and payments.
Factur-X / ZUGFeRD and EN 16931 — where the SIREN/SIRET identifies the parties.