Generate last 4 digits

[lala]

I am trying to get the last 4 digits of a mastercard to pass fraud detection. Is there anyway to generate the last 4 digits of a card if I have the first 12 digits of the card number?

Like an algorithim or something? I will +rep anyone who can help me out.

 

[Zugor]

Here you go, credit card numbers is based on "Luhn algorithm"
http://en.wikipedia.org/wiki/Luhn_algorithm
http://www.thetaoofmakingmoney.com/2007/04/12/324.html

 

[krylon]

if you can find an old program called rencode. I used to do this back in the day, would generate stuff that would slide for like 50$ at a time all day. don't know if it still works, but i can't find the program anywhere. I believe it's made by kelly @ e-scan

 

[atas]

isnt kelly from escan a rat?

 

[kkk]

no way. Luhn algorithm is a generation of the last, 16th, digit.
so first 6 are bin, then 7-15 - account number, and 16th - control number.
if you don't know correct 14 and 15th digits then you will have a lot of valid variants.