MasterCard numbers typically begin with numbers from 2 through 7 and are usually 16 digits long. Discover cards often begin with 6011, 645, or 65 and are generally 16 digits long.
Understanding the Industry Standard Card Structure IIN to Check Digit
Major Network Issuer Rules Different credit card networks have specific rules that dictate the appearance and length of their numbers. Application in Development and Testing.
Account Number and Check Digit Following the IIN is the unique account number, which varies in length depending on the issuer. Adhering to these rules is necessary when generating or analyzing card data, as it ensures the number aligns with the expectations of the payment network.
Understanding the Industry Standard Card Structure
Doubling every second digit, if the result of that doubling is greater than 9, you add the digits of the product together. Finally, the sequence concludes with a single check digit, calculated using the Luhn algorithm.
More About How to write credit card number
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