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# Test Credit Card Account Numbers

, 2 Oct 2011 CPOL
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Prefix, Length, and Check Digit CriteriaHere is a table outlining the major credit cards that you might want to validate.CARD TYPE Prefix Length Check digit algorithmMASTERCARD 51-55 16 mod 10VISA 4 13, 16 mod 10AMEX 3437 15 mod 10Diners Club/Carte...
1. Prefix, Length, and Check Digit Criteria

Here is a table outlining the major credit cards that you might want to validate.

CARD TYPE Prefix Length Check digit algorithm
MASTERCARD 51-55 16 mod 10
VISA 4 13, 16 mod 10
AMEX 34
37 15 mod 10
Diners Club/
Carte Blanche 300-305
36
38 14 mod 10
Discover 6011 16 mod 10
enRoute 2014
2149 15 any
JCB 3 16 mod 10
JCB 2131
1800 15 mod 10

2. LUHN Formula (Mod 10) for Validation of Primary Account Number
The following steps are required to validate the primary account number:

Step 1: Double the value of alternate digits of the primary account number beginning with the second digit from the right (the first right--hand digit is the check digit.)

Step 2: Add the individual digits comprising the products obtained in Step 1 to each of the unaffected digits in the original number.

Step 3: The total obtained in Step 2 must be a number ending in zero (30, 40, 50, etc.) for the account number to be validated.

For example, to validate the primary account number 49927398716:

Step 1:

4 9 9 2 7 3 9 8 7 1 6
x2 x2 x2 x2 x2
------------------------------
18 4 6 16 2

Step 2: 4 +(1+8)+ 9 + (4) + 7 + (6) + 9 +(1+6) + 7 + (2) + 6

Step 3: Sum = 70 : Card number is validated

Note: Card is valid because the 70/10 yields no remainder.

Source: http://www.beachnet.com/~hstiles/cardtype.html[^]

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