For example, American Express card numbers start with 37 Carte Blanche and Diners Club with 38. The structure of the card number varies by system. Other numbers are used to identify the industry. Visa starts with 4, a Mastercard is 5 and Discover is 6. Since a '4' always corresponds with a Visa card, the '4147' credit card type is a Visa card! If the first digit were a 3 it'd be an American Express card, Diner's Club card, Carte Blanche card, or a JCB card. A BIN refers to the first six (6) digits of a credit or debit card number and is used to identify the card issuing institution. Mastercard is now beginning to issue credit and debit cards with a BIN starting with the number 2. The numbers are spaced in four groups of four digits each, like this: “5xxx xxxx xxxx xxxx”. What are the first 4 digits of a Mastercard? So all MasterCard debit and credit card numbers start with 50, 51, 52, 53, 54 or 55 and are 16-digit long.
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