Identifier Validation

This page groups seven validators for checking structured identifiers. Validator IBAN, BIC validator and SIREN validator are part of this set. Developers, finance teams and support staff can verify an entry before saving or sending it. These seven validators are free, need no account, and execute in the browser.

Identify the identifier type first. Validator IBAN and BIC validator cover international banking data. SIREN validator and SIRET validator target French company numbers. ISBN validator covers books, Luhn Validator applies to many numbers and Card brand detector identifies a network then checks the key. Start with the validator named after your format.

How to use

  1. Identify the identifier type, then start with the validator named for it, such as Validator IBAN or BIC validator.
  2. For a French company number, use SIREN validator or SIRET validator depending on whether it is a company or an establishment.
  3. For a book or a generic number, go through ISBN validator or Luhn Validator according to the expected key.
  4. For a card, finish with Card brand detector to identify the network and then check the Luhn key.

Frequently asked questions

Do these validators prove that an identifier really exists?

No. They check structure and a control key, such as modulo 97 or the Luhn algorithm. An identifier can be well formed without being assigned. Treat the result as a first filter, not as proof of existence.

What is the difference between SIREN validator and SIRET validator?

SIREN identifies a company, while SIRET identifies an establishment. Both validators check the structure and the matching Luhn key. Use the first for a company number and the second for an establishment address.

Does Card brand detector store the entered number?

No. It identifies the network and checks the Luhn key in the browser. Still avoid entering a real card number on a page that does not need it. For tests, use a fictional number intended for that purpose.

In what order should I check an IBAN and a BIC?

Start with Validator IBAN to check the structure and the modulo 97 key. Then use BIC validator to check the structure of the associated code. This order separates the account from the institution and avoids mixing two formats.

Can Luhn Validator replace specialized validators?

No. Luhn Validator checks the algorithm on many numbers, but SIREN validator, SIRET validator, ISBN validator and Card brand detector apply their own rules. Start with the specialized validator, then use Luhn Validator if you need to isolate the key.

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