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Business registration number validation

Checks whether a business registration number is valid using the tax authority's checksum rule. Free.

Business registration number (10 digits)

Business registration number validation

National Tax Service Checksum ruleto check whether the number is in a valid format.
Checks format validity only (verify actual registration or closure status via the NTS "business status lookup").

What is Business Registration Number Validator?

A tool that checks the validity of a Korean business registration number (10 digits). It uses the National Tax Service's validation rule to confirm whether the number is formally correct.

How it works

1 Enter the 10-digit business registration number.
2 Check whether it is valid.

Frequently Asked Questions

Can it tell whether the business actually exists? ⌄

It validates the number's formal validity (checksum). Confirming real existence requires a National Tax Service lookup.

Can I include hyphens? ⌄

You can enter only digits; formatting symbols are handled automatically.

Business registration number validation