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How many digits does a MasterCard have? A: A MasterCard has a total of 16 digits. MasterCard, as well as most major credit card systems, use the ANSI Standard X4.13-1983 system, in which each digit identifies a particular attribute of the card.
Each type of account number hasspecific lengths, which can serve as a secondary method to identify the type of credit card. For example, Visa account numbers are either 13 or 15 digits long. If you see a credit card number that starts with a 4 and contains 13 or 15 digits, you can assume it's a Visa. Mastercard and Discover account numbers contain 16 digits. American Express contains 15 digits, and Diner's Club and Carte Blanche contain 14 digits.