IBAN Validator

Enter any IBAN to check if it's valid. We verify the country code, total length, character format, and MOD-97 check digits.

How IBAN Validation Works

IBAN validation involves three checks:

1. Format check: The IBAN must start with two letters (country code), followed by two digits (check digits), then 11-30 alphanumeric characters. Total length must match the country's expected length.
2. Country check: The first two characters must be a valid ISO country code that participates in the IBAN system.
3. MOD-97 check: The IBAN is rearranged (move first 4 chars to end), letters are converted to numbers (A=10, B=11, ..., Z=35), and the resulting huge integer must give remainder 1 when divided by 97.

Learn more about the MOD-97 algorithm →