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IBAN

Example IBANs

Country	IBAN
United Kingdom	GB33BUKB20201555555555
Germany	DE75512108001245126199
France	FR2531682128768051490609537
Netherlands	NL02ABNA0123456789
Switzerland	CH5604835012345678009
Poland	PL61109010140000071219812874

</> Code Implementation

# IBAN Validator — MOD-97 check digit verification
# No external dependencies required

def iban_validate(iban: str) -> dict:
    iban = iban.replace(" ", "").upper()
    if len(iban) < 5:
        return {"valid": False, "error": "Too short"}
    country = iban[:2]
    rearranged = iban[4:] + iban[:4]
    numeric = "".join(
        str(ord(c) - ord("A") + 10) if c.isalpha() else c
        for c in rearranged
    )
    remainder = int(numeric) % 97
    return {
        "valid": remainder == 1,
        "country": country,
        "check_digits": iban[2:4],
        "bban": iban[4:],
        "remainder": remainder,
    }

# Example
result = iban_validate("GB82 WEST 1234 5698 7654 32")
print(f"Valid   : {result['valid']}")
print(f"Country : {result['country']}")
print(f"BBAN    : {result['bban']}")
# Valid   : True
# Country : GB
# BBAN    : WEST12345698765432