Calculator splits given account number (IBAN) into parts such as ISO country code, check digits etc.
Some facts
- IBAN (International Bank Account Number) is a standardized method of numbering bank accounts.
- The IBAN standard defines only general scheme allowing validation and recognition of the region where the account is located.
- Each IBAN number consists of three constant parts:
- country code - two-letter code defining the region in which the account is located (e.g. PL for accounts in Poland),
- checksum - two-digit number calculated on the basis of other digits, this part allows checking whether the given IBAN number is correct or not,
- regional part - this is part specific for a given region, both its length and the meaning of particular digits depend on local standards agreed in a given country (e.g. in Poland this part consists of 24 digits containing the national bank code, branch code, additional checksum digit and internal bank account number).
- To check if the given IBAN number is correct, the following validation algorithm is used:
- ignore whitespaces (spaces, tabs),
- check if the length of the number matches the standard in the given region (basing on the country code),
- move the first 4 characters to the end of the number,
- replace letters by two-digit numbers according to the below rule:
- A → 10,
- B → 11,
- C → 12,
- etc.
- treat the obtained digits as one number and calculate its remainder of division by 97,
- IBAN is correct if the remainder of the division is 1, otherwise the number is invalid.
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