Comments on: How to Tell if a Credit Card Number is a Fake

By: nicolebisnath

nicolebisnath — Tue, 07 Feb 2012 21:52:30 +0000

how can i get a loan if im not working and have no collateral in ontario?

By: alia

alia — Fri, 19 Nov 2010 21:18:30 +0000

SO TRUE!!!!!!!!!!!!!!!

By: Ralph Awka

Ralph Awka — Tue, 24 Aug 2010 11:10:50 +0000

please i need card visa that have big fund on it with the billing address info.

please please please

By: mandydog

mandydog — Wed, 30 Dec 2009 23:42:35 +0000

in fact the first 6 digits indicate the bank, and there’s a LOT more info embedded too, depending on the issuer.

wikipedia.org/wiki/bank_card_number is surprisingly accurate, though see the ‘talk’ section too.
howstuffworks.com also has a useful article.

enjoy, and have a happy ny

By: Kevin Beck

Kevin Beck — Tue, 15 Dec 2009 04:44:40 +0000

All American Express cards start with 3; all Visa cards start with 4; all MasterCard cards start with 5; and all Discover cards start wtih 6. The first four digits of a card number are unique to the bank issuing the card, and the second set of digits are also unique to the card issuer.

By: DaK

DaK — Sat, 07 Nov 2009 17:34:20 +0000

Then, I googled for the algorithm. I read the instruction too fast. Mine add to 50, 60, 70. So , yes they are all valid.

You double only every 2nd digit starting from the 2nd digit on the right.

If 16 digits, it is the same as the 1st, 3rd, 5th, etc.

Thanks DR.

By: DaK

DaK — Sat, 07 Nov 2009 17:24:38 +0000

It didn’t work for me. Sounds cool, but all 3 of my cards added to 36, 67, 54.

By: Credit Card Chaser

Credit Card Chaser — Fri, 06 Nov 2009 06:01:31 +0000

Did you also know that depending on the length of the credit card number, the chances of keying in an incorrect number can be 1 in 100,000 or even 1 in a trillion?

By: SingleGuyMoney

SingleGuyMoney — Fri, 06 Nov 2009 02:30:05 +0000

That’s pretty cool. Of course, like the others, I had to try it and see if it worked with one of my “real” cards.

I also remember reading a blog post somewhere that said the numbers also indicate the bank issuing the card, the type of card (Visa, MC, Amex, etc). I don’t remember which set of numbers indicate which.

By: Len Penzo

Len Penzo — Fri, 06 Nov 2009 01:17:31 +0000

That was too cool!

Lucky for me I only had two fake cards in my wallet.

Maybe if somebody had told Tom Hanks at the beginning of the Da Vinci Code about the Luhn algorithm, he might have had a much easier time unlocking the secrets of the Knights Templar. Or not.

Oh, never mind.

Len
Len Penzo dot Com