All the information needed to verify your account number, the country of origin of your bank, and other account details is found in the IBAN.
If an IBAN is entered incorrectly and there is no account associated with it, the transaction will fail. If a comparable account exists, the bank completes the transfer. For any reversal to be done, the recipient must give permission.
To guarantee that legal IBANs are error-free, several banks use an IBAN checker, also known as an IBAN lookup.