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

BBAN Number - dCode

Tag(s) : Checksum

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

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 checksum key.

Example: In France a BBAN/RIB has 23 characters: bank code (5 digits) + counter code (5 digits) + account number (11 digits and / or letters) + RIB key (2 digits between 01 and 97).

The algorithm checks the BBAN key via a modulo 97:

Example: The bank number is: 12345 12345 0123456789AZ 03

Step 1: Remove the key BBAN code.

Example: The key is composed of the last 2 digits: 03. The rest of the calculation is done with 12345 12345 0123456789AZ 00.

Step 2: replace any letters by figures in the table

A, J | 1 |

B, K, S | 2 |

C, L, T | 3 |

D, M, U | 4 |

E, N, V | 5 |

F, O, W | 6 |

G, P, X | 7 |

H, Q, Y | 8 |

I, R, Z | 9 |

Example: A=1 and Z=9, the BBAN becomes 123451234501234567891900

Step 3: Calculate the value of the result modulo 97, then subtract the result to 97.

Example: \( 123451234501234567891900 \mod 97 \equiv 94 \) and \( 97 - 94 = 3 \)

The checksum key is therefore 03 (the key removed previously), the BBAN is valid.

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

Why 97? Because it is a prime number (the largest with 2 digits) that will allow to minimize the errors.

dCode retains ownership of the source code of the script BBAN Number online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. To download the online BBAN Number script for offline use on PC, iPhone or Android, ask for price quote on contact page !

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Source : https://www.dcode.fr/bban-check

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