# Free company data checks

> Check an EIN, DUNS number, LEI, VAT number, SIREN, tax ID or NAICS code in the browser. Free to try, no account and no API key.

Canonical: https://corpoapi.com/checks

- [DUNS Number Search](https://corpoapi.com/checks/duns-number-search): Check the format of a D-U-N-S number and see where a nine-digit number comes from.
- [Look Up a Company EIN](https://corpoapi.com/checks/ein-lookup): Check whether a nine-digit number is a well-formed EIN, and find out where to look for the company behind one.
- [LEI Search](https://corpoapi.com/checks/lei-search): Check the format of a 20-character LEI, including its ISO 17442 check digits.
- [NAICS Code Lookup](https://corpoapi.com/checks/naics-code-lookup): Look up a NAICS 2022 code or find the code for a business activity, with the official title and parent sector.
- [SIREN Number Lookup](https://corpoapi.com/checks/siren-check): Check a French SIREN number and see where the company behind it is confirmed.
- [Tax ID Format Check (EIN, VAT, SIREN)](https://corpoapi.com/checks/tax-id-lookup): Check whether a tax ID or TIN is the right shape for its country, for the countries we already validate.
- [VAT Number Checker](https://corpoapi.com/checks/vat-number-check): Check an EU VAT number against the VAT register and get the registered business name and address back.