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BBAN Number

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.

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BBAN Number -

Tag(s) : Checksum

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# BBAN Number

## BBAN number checker/validator

NB: Do not confuse with IBAN. This tool checks BBAN, for full IBAN numbers, dCode has a tool for that:

⮞ Go to: IBAN Number

## BBAN checksum calculator

### What is a BBAN? (Definition)

A BBAN (Basic Bank Account Number) is a number identifying a bank account in a country. It is composed of 10 to 30 characters, depending on countries, these characters include 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).
French BBAN number: 12345 12345 0123456789A 03

### What is the difference between BBAN and IBAN?

An IBAN contains the data of the BBAN, but a BBAN does not contain all the data of an IBAN.

A BBAN is limited to one country and cannot be used for an international transfer, but only within the corresponding country.

### How to check if a BBAN is false/fraudulent?

It is not possible to verify that a BBAN exists with certainty (that is to say, that there is indeed a bank that contains this bank account and that account is active, with money on it), indeed, only banks know their account numbers and associated RIBs and this data is a banking secret. On the other hand, it is possible to check that a RIB is technically valid (that is to say that it does not contain an error in its digits / characters) thanks to the control key which is integrated into the BBAN and which therefore allows a partial verification. If the validation fails, then the RIB is necessarily false/erroneous.

### How to verify an BBAN number? (Validity check)

The algorithm for the validation calculator 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.

### Why the modulo 97?

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

## Source code

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BBAN Number on dCode.fr [online website], retrieved on 2023-12-03, https://www.dcode.fr/bban-check

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