SIRET code

The SIRET code (French: "Système d’identification du répertoire des établissements"), or SIRET number, is an INSEE code which allows the geographic identification of any French establishment or business.
Construction.
This 14-figure numerical identifier is split into two parts: 
For example, 732 829 320 00074 would refer to the seventh establishment (followed by 4 as the check digit) of the business with SIREN number 732 829 320.
Notable exceptions.
SIRET is not always a simple 14-digit number. In certain geographic areas like Monaco, it can also be a series of alphanumeric characters, for example, MONACOCONFO001.
Calculating a valid code.
The SIRET number's check digit (the last) that verifies the validity of the SIRET number (SIREN + NIC). It is calculated using the Luhn formula.