Your card number is carefully structured. The very first digit is what’s known as the major industry identifier. A 4 means ...

Most of us carry credit cards and ATM cards. These, typically, have sixteen digits on the front. These digits are the unique account number for the card. For obvious reasons, just any sixteen digits ...

That long number isn't random, and it identifies more than just whose account the card belongs to. Many or all of the products on this page are from partners who compensate us when you click to or ...