This document describe bank account validation rules for following countries:
Document extracted from www.credit-card.be

The Belgium account format is XXX-YYYYYYY-ZZ

XXX = A number that give the bank code.

YYYYYYY = A number that give the account number.

ZZ = check digit. It's the rest of the division of XXXYYYYYYY by 97.

No specific validation is made.

In Switzerland, each bank can have its own validation method.

There is no specific validation except a format validation.

The account can be any where in the account field. To find the account in the field, we use the first word that start with a digit.

The format is XXXXXX-YY-ZZZZZZZZZZZZZ

XXXXXX = 6 digits.

YY = 2 digits.

ZZ..ZZ = 2 to 13 digits.

Check

There is no specific validation except a format validation.

The account can be any where in the account field. To find the account in the field, we use the first word that start with a digit.

The format is XXXX-Y...Y )

XXXX = The register number in 4 digits.

Y..Y = 1 to n digits.

Check

In french there are several account type.

You have the RIB account that is the "Releve d'Identite Bancaire".

You have the SIREN account that is the "Systeme d'Identification et de Repertoire des Entreprises au niveau National".

These both account type start with a number. For particular case, it's possible to put the account number any where in the account field.

The rule to detect the account number is defined as follow.

The account number is any words that start with a digit. For example you can give "CPP XXXXX-YYYYY-ZZZZZZZZZZZ-RR TO SEE" where the first X must be a digit.

To know the account type, we using the account length.

The RIB is the "Releve d'Identite Bancaire".

The format is XXXXX-YYYYY-ZZZZZZZZZZZ-RR where

XXXXX = A number in 5 digits that gives a bank code.

YYYYY = A number in 5 digits that gives a "code guichet".

ZZZZZZZZZZZ = A string of 1 to 11 positions that gives the account number. The account can have digits or letters. When a letter is present, it's replace by its EBCDIC equivalent.

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

RR = A number that gives the check digit.

Validation:

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The rule used to valid the account is defined as follow:

First we replace the letter in account number (Z) by their digit equivalent.

After we adding missing zero to the left of the account (Z) to give it a length of 11 positions.

Once the account is built, we concatenate all four parts to give a number of 23 positions.

An account is valid when the rest of the division XXXXXYYYYYZZZZZZZZZZZRR by 97 is zero.

Check

The SIREN account is the "Systeme d'Identification et de Repertoire des Entreprises au niveau National". This account number is attributed by the French bank and is mandatory when the amount is greater than 100.000 FRF.

The format is XXXXXXXXX where

XXXXXXXXX = A number in 9 digits.

Validation:

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A 9 digits number computed as follow:

- Multiply the odd digit by 1

- Multiply the event digit by 2

- Add the digit obtain for the number greater than 10 to give only one digit (14 give 1+4 = 5).

- The sum must be a multiple of 10

Example:

--------

7 7 5 6 7 0 5 9 9

X 1 2 1 2 1 2 1 2 1

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( 7 + 14 + 5 + 12 + 7 + 0 + 5 + 18 + 9 )

= 7 + 5 + 5 + 3 + 7 + 0 + 5 + 9 + 9 = 50

There is no specific validation except a format validation.

The account can be any where in the account field. To find the account in the field, we use the first word that start with a digit.

The format is XXXX-YY-ZZZZZZZZZZ or XX-XX-YY-ZZZZZZZZZZ

XXXX = 4 digits that can be splited into 2 fields to 2 digits.

YY = 2 digits.

Z..Z = 1 to 10 digits.

See (GB) United Kingdom.

There is no specific validation except a format validation.

The account can be any where in the account field. To find the account in the field, we use the first word that start with a digit.

The format is WWWW-0-YYYY-ZZZZZZZZ

WWWW = 4 digits. (A.B.I Code)

X = 1 digit. Must be zero.

YYYY = 4 digits. Agency code. (C.A.B)

Z..Z = 1 to 8 digits. Account number.

In Nederland there are two kind of account.

There is the post account and the commercial bank account.

The post account has the format XXXXX-Y-Z and the commercial bank account have the format XXXXXX-YYY.

In both case, the account number can be any where in the account field. The account is identified by its first character that must be a digit.

To choose the validation method, we use the account length.

The post account has a length of 9 and the commercial bank account a length of 10.

(NL) Nederland account post validation

Only a format validation is made.

The format is XXXXX-Y-Z where X, Y, Z must be a digit.

(NL) Nederland account commercial validation

The format is XXXXXX-YYY.

Validation:

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First we concatenate the X and Y to give a number in 9 positions.

We making the sum of each digit multiply by a number that start at 9 to 1

The account is valid when the rest of the division of the sum by 11 is zero.

For example let's take the 762536-454

7 6 2 5 3 6 4 5 4

X 9 8 7 6 5 4 3 2 1

------------------------------------------

63 + 48 + 14 + 30 + 15 + 24 + 12 + 10 + 4 = 220

220 : 11 = 20 rest 0

Check

In Sweden there are two kind of account.

There is the "Banque d'epargne" account and the other bank account.

The "Banque d'epargne" account is a number in 10 positions and the other bank account have the format WWWW-XX-YYYY-Z.

In both can, the account number can be any where in the account field. The account is identified by its first character that must be a digit.

To choose the validation method, we use the account length.

The "Banque d'epargne" account has a length of 10 and the other bank account a length of 14.

(SE) Sweden "Banque d'epargne" account validation

There is no validation made.

(SE) Sweden other account validation

The format is WWWW-XX-YYYY-Z.

Validation:

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First we concatenate the X and Y to give a number in 11 positions.

We making the sum of each digit multiply by a number that start at 11 to 1

The account is valid when the rest of the division of the sum by 11 is zero.

For example let's take the 1234-12-1234-4

1 2 3 4 1 2 1 2 3 4 4

X 11 10 9 8 7 6 5 4 3 2 1

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11 + 20 + 27 + 32 + 7 + 12 + 5 + 8 + 9 + 8 + 4 = 143

143 : 11 = 13 rest 0