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Breaking the Credit Card Codes. Here is the Hacker Cipher.

I’m always surprised when I give people my credit card number and then they ask me if it’s a Visa or MasterCard. These thing have some logic behind them but everybody doesn’t know the secrets to the codes.

If you reach into your wallet you’ll find that all your Visa cards will begin with a 4. All your MasterCards will begin with a 5. American Express typically begins with 34 or 37 and Discover usually starts with a 6011, 644, or 65.

That little combination on your credit card tells still a bigger story. Not only does it identify the type of card but it uses itself to make sure the number os real.

And the code to check a credit card is so simple, it’s brilliant.

Cards are specifically identified by their Issuer Identification Number (IIN). The first six numbers on the card identify exactly who issued the card.

For example.

  • 360711; DINERS CLUB INTERNATIONAL; FIRST INVESTMENT BANK; CREDIT; CLASSIC; BULGARIA
  • 361387; DINERS CLUB INTERNATIONAL; CITIBANK; CREDIT; UNITED STATES; US;
  • 370244; AMERICAN EXPRESS; BANESCO; CREDIT; GOLD; VENEZUELA
  • 371271; AMERICAN EXPRESS; DELTA SKYMILES; CREDIT; UNITED STATES;US; USA
  • 371288; AMERICAN EXPRESS; COSTCO WHOLESALE; CREDIT; CASH REBATE; UNITED STATES; USA
  • 400785; VISA; LAFAYETTE SAVINGS BANK, FSB; DEBIT; CLASSIC; UNITED STATES; USA
  • 424723; VISA; BAY FEDERAL CREDIT UNION; CREDIT; GOLD PREMIUM; UNITED STATES; USA
  • 500235; MAESTRO; NBC NATIONAL BANK OF CANADA; DEBIT; ATM CARD; CANADA
  • 514999; MASTERCARD; JACK HENRY & ASSOCIATES; CREDIT; STANDARD; UNITED STATES
  • 622789; CHINA UNION PAY; BANK OF CHINA; CREDIT; PLATINUM; SINGAPORE
  • 630490; LASER; BANK OF IRELAND; DEBIT; CLASSIC; IRELAND
  • 633301; SWITCH/MAESTRO; YORKSHIRE BANK PLC; DEBIT; UNITED KINGDOM
  • 644544; DISCOVER; BANK OF AMERICA; CREDIT; UNITED STATES

    Great Infographic

    Here is a great graphic that was put out by Mint.com to help explain this even further.

    Breaking the Credit Card Codes. Here is the Hacker Cipher.

    Right about now I bet you’re reaching for your wallet to check your own cards. If you want to check out this information, pull out on of your Visa or MasterCards and use the first six numbers to confirm your IIN, here.

    Breaking the Credit Card Codes. Here is the Hacker Cipher.
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    Breaking the Credit Card Codes. Here is the Hacker Cipher. by
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    About Steve Rhode

    Steve Rhode
    Steve Rhode is the Get Out of Debt Guy and has been helping good people with bad debt problems since 1994. You can learn more about Steve, here.

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