What numbers are there on the MasterCard card number?

A MasterCard card number consists of 16 digits, typically grouped into four sets of four digits. The first digit indicates the card network, with MasterCard numbers starting with a number between 51 and 55 or with a range of 2221 to 2720. The next digits represent the issuer identification number (IIN), followed by the individual account number, and ending with a check digit for validation. This structure helps ensure secure transactions and proper routing within the payment processing system.