International Bank Account Numbers(IBAN)

IBAN number has a series of alphanumeric characters, all of which represent an important information to money transfer process. IBAN length is different for different countries but it is same for all the bank account holders of a country, i.e. UK's Banks Account Holders, IBAN length is 22 characters, France IBAN length is 27. In general, an IBAN number is divided into the following parts:
1. Country code : From left postion 1-2
2. Check digit code : position 3-4
3. Bank identifier code : length differs from country to country
4. Branch code : Not in all countries and length differs from country to country
5. Account number length differs from country to country
The last three (bank, branch, and account numbers) collectively make up the Basic Bank Account Number (BBAN).
To create an example, here's a hypothetical IBAN from a bank in Cyprus:
GB29NWBK60161331926819
Although IBANs are used without any spaces in financial transactions, for convenience we can add some here to make interpreting our fictitious IBAN a little easier.
GB 29 NWBK 601613 31926819
As you can see, United Kingdom uses 22 characters across five sections.
1. The first two characters are the ISO country code. GB is used for Great Britain.
2. The two digits following the country code (29) are the check digits. They help to validate the account number.
3. The next section (NWBK) is the bank code. Obviously, this identifies the specific bank that holds the account. NWBK has been assigned to NATIONAL WESTMINSTER BANK PLC.
4. The fourth string of characters (601613) is the branch code. NATIONAL WESTMINSTER BANK PLC Branch identifier, 601613.
5. Finally, we get to the last string of characters (31926819), which represent a Bank Account Number in NATIONAL WESTMINSTER BANK PLC.