there is a specific way the card numbers are issued by companies and that you could tell by the number which company issued it. Here is a good resource for tha

there is a specific way the card numbers are issued by companies and that you could tell by the number which company issued it. Here is a good resource for that info: http://www.merriampark.com/anatomycc.htm http://www.merriampark.com/anatomycc.htm