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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 digit is always 3, 4, 5 or 6. Credit card companies use a standardized system of assigning numbers. 3 means it is an American Express or Diners Club credit card. Credit cards beginning with 4 means that it is a Visa card. If your credit card numbers starts with 5 it represents a MasterCard. And in the case of a credit card number beginning with 6, it is a Discover credit card. The other numbers are used to carry various other information. Visa a major credit card issuer uses the digits 2 through 6 to identify the bank. 7 to 12 or 15 are used to identify the account number and the last number is called the check digit. The pattern in Visa credit cards can vary greatly because all of Visa credit cards do not have the same amount of digits on credit cards.