The Secret of Credit Card Numbers - Page 5
MasterCard
For MasterCard, the second digit, through to anywhere between the third and the sixth digit is the bank number. All remaining digits, except the check digit at the end of the series, identifies that cardholder's account.
Now that we've gone over it all, you're probably wondering why you were ever wondering in the first place. Just remember though, knowledge is power. Some things are just fun to know.
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