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Test Credit Card Account Numbers

By , 2 Oct 2011
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  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[^]

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Anshul R
Student
India India
No Biography provided

Comments and Discussions

 
GeneralReason for my vote of 5 Good for validation PinmemberMaulikDusara25-Sep-11 20:49 

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