Free SIRET number check
This tool checks a 14-digit French SIRET number for free: format and check digit, then whether it exists in INSEE's SIRENE register, whether the establishment is active or closed, whether it is the head office, its town and NAF code. No account needed; the French page also checks up to 50 SIRETs at once.
Sample result
SampleSIRET
123 456 709 00013
- Company
- EXAMPLE COMPANY SAS
- Format
- Valid
- Establishment
- Active
- Town
- Lyon
Source: INSEE SIRENE · fictional sample
Sources: INSEE SIRENE, INSEE, SIRENE register (Licence Ouverte) · Updated on
How does it work?
- Enter the SIRET, with or without spaces.
- The tool checks the format and the Luhn check digit.
- It looks the establishment up in SIRENE and shows its status, town and company.
- For a supplier list, use the batch mode on the French page (up to 50 SIRETs).
What is a SIRET number?
A SIRET identifies an establishment of a French company: the 9 digits of the company's SIREN followed by the 5 digits of the NIC. A check digit (Luhn algorithm) catches typing errors.
What data do you get?
The tool tells apart a malformed SIRET, a well-formed but unknown SIRET, and an establishment found in the register.
| Field | Description | Source | Freshness |
|---|---|---|---|
| Format | 14 digits and valid Luhn check | Computed | Instant |
| Found | Present or not in SIRENE | INSEE SIRENE | Daily |
| Status | Active or closed | INSEE SIRENE | Daily |
| Head office | Head office or branch | INSEE SIRENE | Daily |
| Town, NAF code, creation date | Of the establishment | INSEE SIRENE | Daily |
| Company | Name, SIREN and computed VAT number | INSEE SIRENE | Daily |
What does it return on a real number?
A SIRET can be well formed and still not exist. SIRET 552 100 554 00013 passes the check-digit test, but no establishment matches it in SIRENE. SIRET 552 024 671 00091 is the active head office of CEGOS in Issy-les-Moulineaux, created on 26 April 2006, NAF code 70.22Z (retrieved on 12 November 2026 from Reachable's public API).
What are the limits?
The tool checks existence and status, not who you are dealing with. Establishments with restricted disclosure show no name or address. Result labels are in French.
How can you go further?
To get the company's VAT number, use the French VAT number lookup. To follow these companies over time, add them to a Reachable list: the check reruns daily, weekly or monthly, and you are notified when something changes. Your AI assistant can drive the list through the MCP server. Source details are on the sources page; the price of a scheduled check is on the pricing page.