The Secret of Credit Card Numbers - Page 2
The very first digit in the series will be a 3,4,5, 0r 6. This number designates the type of card as follows:
3 = a Travel & Entertainment Card like American Express or Diners Club.
4 = Visa and Visa-branded debit cards, cash cards, etc.
5 = MasterCard and MasterCard-branded debit cards, cash cards, etc.
6 = Discover
American Express and Diners Club use the second digit to identify the company. That means that Diners Club cards will start with either "36" or "38", and American Express cards will use either "34" or "37".
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