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Tool to check BBAN numbers. The BBAN (Basic Bank Account Number) algorithm allows to check if a BBAN number is correct.

Answers to Questions

What is a BBAN?

A BBAN (Basic Bank Account Number) is composed of 10 to 30 characters, depending on countries, corresponding to the bank codes (including the account number) and a cheksum key.

How to verify an BBAN number? (Validity check)

The algorithm checks the BBAN key via a modulo 97:

Consider the RIB: 12345 12345 0123456789AZ 96

Step 1: Remove the key BBAN code.

The key is composed of the last 2 digits: 96. The rest of the calculation is done with 12345 12345 0123456789AZ.

Step 3: Calculate the value of the result modulo 97.

$$ 12345123450123456789AZ \mod 97 \equiv 96 $$

The checksum key is therefore 96 (the key removed at the beginning), the BBAN is valid.

To make this modulo calculation you must use a calculator that accepts calculation with large numbers (arbitrary precision) as proposed on Dcode.

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Source code

dCode retains ownership of the source code of the script BBAN (Number checksum). Except explicit open source licence (free / freeware), any algorithm, applet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any snippet or function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in PHP (or Java, C#, Python, Javascript, etc.) which dCode owns rights can be transferred after sales quote. So if you need to download the BBAN (Number checksum) script for offline use, for you, your company or association, see you on contact page !

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