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 0123456789A 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 0123456789A 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, the BBAN becomes 12345123450123456789100

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

Example: \( 12345123450123456789100 \mod 97 \equiv 94 \) 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.

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

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