IBAN validation and IBAN generation

An IBAN is an International Bank Account Number. It standardizes bank account details for domestic and international payments and helps identify bank accounts reliably.

An IBAN consists of a country code, two check digits and a country-specific account identifier. In Germany, this identifier includes bank code and account number.

IBAN-Test checks structure, length and check digits. For selected countries, additional validation against bank directories is available.

The IBAN check validates whether an IBAN is formally correct. This includes country code, length, allowed characters and check digits.

Where reliable bank data is available, IBAN-Test can also validate bank and account details and return information such as bank name, city or BIC.

This helps catch typos, transposed digits and invalid bank details before a payment or direct debit fails.

The IBAN generator creates an IBAN from country-specific bank details. For Germany, this means bank code and account number.

IBAN-Test calculates the check digits, formats the IBAN and, where possible, validates the underlying bank data. This means the result is not only formatted correctly, but also checked for plausibility.

For automated processes, IBAN generation is also available through the API.

First check whether the IBAN was entered completely and whether it contains typos or transposed digits. IBAN-Test removes spaces automatically, but incorrect digits still matter.

If the IBAN remains invalid, ask the account holder to confirm the bank details. Invalid IBANs can lead to failed payments, returned direct debits and manual clarification work.

If you need to validate many IBANs in forms or processes, validating directly at input time through the IBAN-Test API is recommended.

The IBAN check validates whether an IBAN is formally correct. This includes country code, length, character sequence and check digits.

Bank data validation goes further: where reliable bank directories are available, IBAN-Test can also validate bank details and return bank name, city or BIC.

For forms, shops and SEPA processes, this additional validation is useful because it catches errors before payments fail.

Yes. The API includes an endpoint for BIC validation. You can check whether a BIC is formally valid and, where available, receive matching bank data hints.

GET /v2/bic/validate/{bic}

Full details are available in the API documentation.