How to Validate a Credit Card With Your Mind The first 6 digits are the Issuer Identification Number. It will lndentify the institution that issued the card. Visa: 4xxxxx Mastercard 51xxxx - 55xxxx Discover: 601 lxx, 644xxx, 65xxxx Amex: 34xxxx, 37xxxx Cards can be looked up by their / auto :: credit card :: infographics
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