What do mastercard numbers look like?

MasterCard numbers typically consist of 16 digits, starting with the digits 51 through 55 or with certain numbers in the 2221-2720 range due to the introduction of the Mastercard range. The first digit indicates the card network, while the subsequent digits provide information about the issuing bank and the account itself. The number is usually grouped in sets of four for easier readability. Additionally, Mastercard numbers follow a specific format and pass the Luhn algorithm to ensure validity.