Check a SIRET number for free

Updated March 2026 - Checking a SIRET number for free is a simple process, but you need to use the right tools. Between private directories, enriched databases and commercial platforms, many companies waste time or take incomplete information at face value. For reliable control, you must return to official sources: INSEE, Business Directory, National Business Register and, if necessary, registration or administrative situation data.

See also: LMNP and SIRET, Help to create your business from A to Z and Business plan.

The SIRET identifies an establishment. It consists of:

• ▸the SIREN of the company;
• ▸an internal classification number of the establishment.

Concretely, the SIRET is used to verify that an establishment is indeed linked to an identified economic entity.

1. Business directory

This public tool allows you to search for a company and check useful basic information:

• ▸identity of the entity;
• ▸SIREN and SIRET number;
• ▸address ;
• ▸activity ;
• ▸administrative state according to available data.

2. The Sirene situation notice

The INSEE service allows you to obtain a situation notice useful for confirming the existence of an establishment in the Sirene directory.

3. The RNE and INPI data

For more documentary checks, data from the National Business Register and the INPI can be valuable.

Hayot Expertise advice: before signing, invoicing, subcontracting or paying, always check the SIRET from a public and recentized source. It is a simple check which avoids many errors upstream.

Checking a SIRET number allows you to:

• ▸confirm the existence of a co-contractor;
• ▸avoid billing errors;
• ▸make a customer or supplier file more reliable;
• ▸prepare a commercial relationship or a subcontracting mission;
• ▸document your internal controls.

Checking a SIRET is not always enough. Depending on the context, you should also look at:

• ▸the quality of the representative;
• ▸the actual activity carried out;
• ▸solvency;
• ▸contractual documents;
• ▸the relevant legal or tax notices.

CTA: Set up a simple documentary check before invoicing

For a reliable process, plan:

• ▸a check upon entering into a relationship;
• ▸a trace of the verification date;
• ▸a periodic update for strategic suppliers;
• ▸additional verification of the documents issued.

Checking a SIRET number for free is easy if you start from the right official bases. The right challenge is not only to find a number, but to make the business relationship, billing and administrative follow-up more reliable.

Do you want to secure your customer, supplier and company document controls? Our firm helps you set up simple, useful and proportionate checks. Make an appointment with an expert

(Official sources: Entreprendre.Service-Public.fr, INSEE, INPI)