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IBAN Number

Tool to check IBAN numbers. The IBAN (International Bank Account Number) algorithm allows checking if an IBAN number is correct.

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IBAN Number -

Tag(s) : Checksum

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IBAN Number

IBAN number checker (International)



Answers to Questions (FAQ)

What is an IBAN? (Definition)

An IBAN (International Bank Account Number) is composed of 14 to 34 characters according to standard ISO13616.

It starts with 2 letters indicating the country code of the bank account, then the checksum control key (between 02 and 98) and from 10 to 30 characters depending on countries that usually identify the bank and the account number.

The IBAN number is used for SEPA mandates (Austria, Belgium, Cyprus, Estonia, Finland, France, Germany, Greece, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Portugal, Slovakia, Slovenia, Spain).

How is an IBAN number made up?

An IBAN number is made up of a series of letters and numbers (14 to 34 characters depending on the country) described in the ISO13616 standard.

It begins with 2 letters indicating the country code of the bank account, followed by the IBAN checksum (between 02 and 98) and 10 to 30 characters depending on the country which correspond to bank codes including the bank account number.

How to verify an IBAN number? (Validity check)

The algorithm checks the country code first among countries accepting IBAN (ISO-13616 norm).

Example: FR for France, other letters for foreign countries

The algorithm starts by moving the 4 first characters (country code and checksum key) at the end of the IBAN and set the key to 2 digits 00.

Example: An invented IBAN: BA51 1234 5678 90DE F123,
it becomes 1234 5678 90DE F123 BA00

Replace each letter in the IBAN by its rank in the alphabet + 9. So A=10, B=11, C=12, etc. Z=35

Example: IBAN becomes 1234567890131415123111000

Calculate the value of this big number modulo 97 and subtract the result to 98 in order to get the control key.

Example: 1234567890131415123101100 mod 97 = 47 and 98-47 = 51. The checksum key is 51.

Check if the two 2 characters after the country code are 51, if yes the IBAN passes validation.

It may be envisaged to perform the verification of the existence of the bank code and the account number, this operation requires adequate databases.

The corresponding regular expression (which is not sufficient) is: [A-Z]{2}[0-9]{2}[A-Z0-9 ]{10,35}

How do I find my IBAN?

The IBAN is generally present on bank identity statements (RIB), but also often on checkbooks or other bank statements.

It is important to note that the IBAN is specific to each bank account, several accounts therefore mean several distinct IBANs.

A form is asking me more characters, what to do?

Sometimes it is asked to concatenate both IBAN and BIC codes (IBAN+BIC or BIC+IBAN).

What is the difference between an IBAN and a BIC/SWIFT?

The IBAN identifies a specific bank account, while the BIC (Bank Identifier Code) or SWIFT (Society for Worldwide Interbank Financial Telecommunication) is used to identify the bank itself.

It is common for the two to be used together.

What is the algorithm for calculating the control key?

A possible source code for programming the checksum calculation is // Pseudo code
function calculateIBANChecksum(iban) {
rearrangedIBAN = iban[4..] + iban[0..1] + "00"
numericIBAN = ""
for each character in rearrangedIBAN {
if (character is a letter) numericIBAN += ASCII code of (character) - 55
else numericIBAN += character
}
checksum = 98 - (numericIBAN % 97)
return checksum
}

Source code

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IBAN Number on dCode.fr [online website], retrieved on 2024-06-15, https://www.dcode.fr/iban-check

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