![]() ![]() The doubled numbers result in: 8 2 2 6 10 14 18 2ģ. If the result of the doubling ends up with a two digits, then add those two digits together:Ĥ. If the final sum is divisible by 10, then the credit card is valid. If it is not divisible by 10, the number is invalid or fake. In the above example, credit card number 4417 1234 5678 9113 has passed the Luhn test. ![]() The Luhn algorithm will detect almost any single-digit error, such as someone mistyping numbers when they put in their credit card. T he Luhn algorithm does not protect against malicious attacks, nor is it intended to. It is primarily a safeguard against simple user errors. Most credit cards and many government identification numbers use this check as a simple method to distinguish valid numbers from random digits. That said, your business shouldn’t have to work out the Luhn algorithm by hand. A cardholder data discovery program, like Card Recon, can scan thousands of credit cards and instantly determine which entries are valid and which ones might be an attempt at unauthorized use. For those interested, a full list of all the RegEx each issuers can be found on this page Ready to learn more about how to protect credit card errors? Check out our data discovery solution, Card Recon.As part of Mastercard’s 2-series expansion back in 2017, their cards can now begin with 2Ī typical string of credit card numbers can be divided into a couple of groups.Major Industry Identifier (MII) - identifies the industry of the card.See here for the full list of industries and digit.Issuer Identification Number (IIN) - identifies the issuer of the card.American Express starts with 34 or 37, Mastercard starts with 2221–2720 or 51–55, Visa starts with 4.Account Number - identifies the cardholder's account.Checksum - makes sure that the account number is valid.Luhn's Algorithm determines the validity of a card using the account number and checksum (labels 3 and 4).From the rightmost digit of your card number, double every digit.If any digit is greater than 9 after the above doubling, add the digits of the result (i.e.Alternatively, the same result can be achieved by subtracting 9 from the that result (i.e. ![]()
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