What are the Number Formats of Different Credit Card Networks? This validation is done using the Luhn algorithm. This value is used to verify whether the rest of the numbers are correctly placed. Last Digit: The last digit in any credit card number is called the ‘checksum’ or the ‘check digit’.6 th to Second-to-Last Digit: All the digits, after the 6 th up till the second-to-last one, are generated uniquely for every cardholder.2 nd to 6 th Digits: The 2 nd, 3 rd, 4 th, 5 th and 6 th digits are used to identify the card issuer e.g., a bank branch.Some card networks use the first 2 digits as their identification as well.įor example, Visa cards always start with a ‘4’ whereas Amex cards always start with a ‘3’ which is immediately followed by either a ‘7’ or a ‘4’. The 1 st Digit: The first digit is the card network indicator.To understand the composition of a credit card number, we can break it down into four parts: What do the Digits on a Credit Card Number Mean? The calculation to compare a credit card number with your checksum is known as the Luhn algorithm. It gives merchants a way to verify the validity of a card number before accepting the customer's payment.
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Enter E-mail to get response? Submit How to do Credit Card ValidationĬredit card numbers are generated according to certain rules.
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