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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.
The first six digits of the credit card number (including the initial MII digit) make up the issuer identifier, which denotes the credit card network to which the number belongs. Some of the better-known issuer identifiers include: American Express -- 34xxxx and 37xxxx ; Visa -- 4xxxxx ; MasterCard -- 51xxxx-55xxxx; Discover -- 6011xx