Check digit
SIREN and SIRET numbers carry a check digit, computed with the Luhn algorithm, with an exception for La Poste. A wrong check digit reveals a typo, without even looking up the register.
Free tool
Check a SIRET or SIREN number
Enter a SIREN (9 digits) or a SIRET (14 digits). TierSafe checks the number's check digit, then looks it up in INSEE's SIRENE register: active or ceased company, open or closed establishment, head office, address, activity and VAT number.
Why check a SIRET number
With e-invoicing, an invoice is routed to your customer from their SIREN, through the directory. A wrong SIREN, or that of a ceased company, and the invoice is rejected before it even reaches them.
In the customer files we analyse, a closed establishment is the most frequent anomaly: the customer moved, and their old SIRET stayed in the software. A single check is enough to spot it.
What the tool checks
Existence
The number is looked up in INSEE's SIRENE register, which lists French companies and all their establishments.
Activity
Active or ceased company, open or closed establishment, with the effective date. For a closed establishment, the tool shows the active SIRET of the same company.
Head office, address and activity
The tool tells you whether the establishment is the company's head office, and gives its address and main activity, with the NAF code and its label (in French).
VAT number
A French intra-EU VAT number is computed from the SIREN. It is shown as active when it appears in the list published daily by the DGFiP, the French tax authority.
Partial disclosure
Some sole traders have asked for their name and address not to be disclosed. This information stays hidden, as on official websites.
Frequently asked questions
What is the difference between a SIREN and a SIRET?
The SIREN, 9 digits long, identifies the company. The SIRET, 14 digits long, identifies one of its establishments: it is the SIREN followed by a 5-digit number, the NIC. A company has a single SIREN, and as many SIRETs as establishments.
Where does the information come from?
From INSEE's SIRENE register, published as open data, of which TierSafe keeps a copy updated every month. The VAT number status comes from the list of active numbers published daily by the DGFiP. No data is requested from a third-party service.
Why is the company name not shown?
The sole trader asked for partial disclosure of their data: their name and address are not public. The number can still be checked, as can its status, active or ceased.
What should I do with a closed establishment?
Replace the old SIRET with that of an open establishment, often the new head office: the tool shows it when the company has one. If the company itself has ceased trading, the third party no longer exists: check whether another company has taken it over.
How many checks can I run?
5 checks per day, SIRET and VAT combined, without signing up. To check a whole file, create an account: the first import is free.
Further reading : SIREN and SIRET: reading and checking a number (in French) · Checking the SIRETs of a whole Excel or CSV file (in French) · Wrong SIREN, VAT or address: why the invoice is blocked (in French) · Check an intra-EU VAT number
A whole file to check?
TierSafe checks the SIREN, SIRET, VAT numbers, addresses, IBANs and e-invoicing addresses of your customer or supplier file in one go, then returns it corrected, ready to re-import. The first import is free.