If the result from Step 4 is divisible by 10, the card number is valid otherwise, it is invalid. Sum the results from Step 2 and Step 3.ĥ. Add all digits in the odd places from right to left in the card number.Ĥ. Now add all single-digit numbers from Step 1.ģ. If doubling of a digit results in a two-digit number, add up the two digits to get a single-digit number.Ģ. Double every second digit from right to left. Almost all credit card numbers are generated following this validity check, commonly known as the Luhn check or the Mod 10 check, which can be described as follows (for illustration, consider the card number 4388576018402626):ġ. The algorithm is useful to determine if a card number is entered correctly or if a credit card is scanned correctly by a scanner. In 1954, Hans Luhn of IBM proposed an algorithm for validating credit card numbers. A credit card number must have between 13 and 16 digits. Credit card numbers follow certain patterns.
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