IBAN Validation and Calculator

Validate an IBAN number based on format, country code, length, and MOD-97 check digit.

Formula

IBAN validation: the first 4 characters are moved to the end, letters are converted to numbers, MOD-97 result must be 1.

Source / method note

IBAN validation logic is based on the ISO 13616 structure for country code, check digit, and MOD-97 verification.

Legal / official rate note

This tool only performs formal validation. It does not guarantee that the IBAN is actually open, active, or belongs to the relevant person; the bank system should be taken as a basis.

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