IBAN is the international bank account number of a customer's bank account with a bank or other financial institution.
This information can be obtained from your bank by requesting the full details of your bank account. The details may or may not contain the IBAN depending on the country where the bank is located and/or the bank itself. If the IBAN number is not available in your bank account details, but you need to fill in the IBAN field in Personal Account, simply enter your bank account number.