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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 4- digit Commonwealth Bank American ExpressÂ® Card code is located on the front of the card, above the card number on the right hand side. With a MasterCardÂ® or Visa card, the 3- digit number is located in the signature panel on the back of the card. The 3 or 4 digit code uniquely identifies that a card number quoted to a merchant was obtained from a genuine credit card therefore providing merchants with an increased level of protection against fraud.