All mainstream credit card numbers obey a mathematical trick designed to catch the most common typos. It’s called the Luhn algorithm, named after IBM researcher Hans Peter Luhn, who patented it in ...

Most of us are curious beings by nature. So, if you've been staying awake at night wondering what your 16-digit credit card number means, it's your lucky day. I'm going to pull back the curtain and ...

Those 15 or 16 numbers embossed on the front of each of your credit cards aren’t randomly assigned. That sequence of digits has actual meaning and indicates everything from your account information to ...

The numbers on a credit card help identify the credit card network, the company that issued the card and the cardholder. Credit card numbers are either 15 or 16 digits, with each digit having its own ...