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(Geeks Are Sexy)   Discover what the numbers on your credit card actually mean   (geeksaresexy.net) divider line 97
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28357 clicks; posted to Main » on 09 May 2012 at 8:41 AM (2 years ago)   |  Favorite    |   share:  Share on Twitter share via Email Share on Facebook   more»



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2012-05-09 01:30:21 AM
Wow that's actually pretty interesting.
 
2012-05-09 08:18:31 AM
I can do that for you. Just send your CC info to me in an email (EIP) and I'll tell you what it says. DO NOT post it in the tread, wouldn't want someone shady to get ahold of it.
 
2012-05-09 08:43:19 AM

James!: I can do that for you. Just send your CC info to me in an email (EIP) and I'll tell you what it says. DO NOT post it in the tread, wouldn't want someone shady to get ahold of it.


I'll do the same, BUT if you also send me the 3 digit number on the back of the card, I'll also tell you what the three digits on the back of the card mean.
 
2012-05-09 08:46:47 AM
It means "You have no money" in my case.

/not true, but I don't have any credit cards, so...
 
2012-05-09 08:47:03 AM

James!: I can do that for you. Just send your CC info to me in an email (EIP) and I'll tell you what it says. DO NOT post it in the tread, wouldn't want someone shady to get ahold of it.


Nah, it's OK to post it here anyways. The Fark filter filters out the num.... Actually, I can't bring myself to do that joke.
 
2012-05-09 08:47:08 AM
I knew the first digits were the issuer and type of card but I didn't know the last digit was a checksum. I still don't like that receipts show the last 4 digits.
 
2012-05-09 08:48:11 AM

The sound of one hand clapping: James!: I can do that for you. Just send your CC info to me in an email (EIP) and I'll tell you what it says. DO NOT post it in the tread, wouldn't want someone shady to get ahold of it.

Nah, it's OK to post it here anyways. The Fark filter filters out the num.... Actually, I can't bring myself to do that joke.


I can:

XXXX-XXXX-XXXX-XXXX

It works!
 
2012-05-09 08:48:21 AM

Grote-Man: James!: I can do that for you. Just send your CC info to me in an email (EIP) and I'll tell you what it says. DO NOT post it in the tread, wouldn't want someone shady to get ahold of it.

I'll do the same, BUT if you also send me the 3 digit number on the back of the card, I'll also tell you what the three digits on the back of the card mean.



ALL THIS AND MORE!!!

Send me the above, plus the expiration date on the card, and I'll tell you the secret of why expiration dates are OBAMA'S POPULATION CONTROL METHOD or something.
 
2012-05-09 08:48:51 AM
Fun fact, Fark will recognize credit cards and blank them. See:

XXXX-XXXX-XXXX-XXXX XX/XX
 
2012-05-09 08:49:02 AM
There's no harm in posting credit card numbers to the thread anyways because the filter will change it to asterisks. See, here's my Visa cc number:

**** **** **** ****
 
2012-05-09 08:49:40 AM
****-****-****-****

Wow, I didn't know Fark's filters worked like that!
 
2012-05-09 08:49:56 AM

dittybopper: I can:

XXXX-XXXX-XXXX-XXXX

It works!


Aw, man, you got there first. Didja know it also works with socials?

XXX-XX-XXXX.

Suh-weet!
 
2012-05-09 08:52:13 AM
Here's what I learned years ago...

Visa starts with 4
Mastercard starts with 5
Discover Card starts with a 6 (and it was primarily 6011 years ago)
American Express starts with 37

Might be outdated info, but I thought it was funny when I worked at a call center and people thought I was up to no good because I could "guess" which card they were using by the first digit.
 
2012-05-09 08:53:03 AM
Hahahahahaha.

Okay, there's no horse any more, just sodden, disturbed ground that smells of rust.
 
2012-05-09 08:55:53 AM
XXXX-XXXX-XXXX-XXXX
PRON-PRON-PRON-PRON
 
2012-05-09 08:56:02 AM
Ok I went to the article after posting my original thoughts... and was immediately distracted by the link at the bottom for Powergirl Cosplay.

/IBIMB
 
2012-05-09 08:58:09 AM
You guys are full of shiat
 
2012-05-09 08:59:00 AM
I'd like to see an article decoding the driver's license numbers of the various states.

When I had a New Jersey license, I noticed that the last five digits corresponded to the two-digit month and two-digit year of my birth, plus the numeric code for my eye color. But that could be coincidence.

Since then I've also had licenses in California and Florida, and their numbers don't have anything remotely obvious, although California's numbers were much shorter than New Jersey's, which was surprising given the difference in population.

I have been told (by unreliable sources) that the last digit of a Florida DL# is the number of times you've been convicted of DUI (yes, mine is a 0).
 
2012-05-09 09:00:47 AM
I love it that the Weeners is from some pocket protector contradicting a minor point in the article.
 
2012-05-09 09:01:05 AM
They mean "This is a debt card. Pay up sucker.".
 
2012-05-09 09:04:29 AM

Rufus Lee King: quick_thinkfast: You guys are full of shiat

No, we aren't.

Oh, wait, yes we are.


No we're not.

/Of course we are.
 
2012-05-09 09:05:40 AM
I still don't understand why all web payment systems online make you specify Visa/MC/Amex, when it's obvious that with about 2 lines of code, they could automatically fill that info in based on the CC you entered. I can't even begin to count the number of times where I accidentally left something at VISA instead of switching to MC and then had to re-enter ALL the information after clicking a submit/buy button. C'mon e-tailers get with it. Amazon seems to be the only people capable of doing this.
 
2012-05-09 09:09:09 AM

kidgenius: I still don't understand why all web payment systems online make you specify Visa/MC/Amex, when it's obvious that with about 2 lines of code, they could automatically fill that info in based on the CC you entered. I can't even begin to count the number of times where I accidentally left something at VISA instead of switching to MC and then had to re-enter ALL the information after clicking a submit/buy button. C'mon e-tailers get with it. Amazon seems to be the only people capable of doing this.


Laziness.

Writing bad code is easier than writing good code. That's why there's so much bad code.
 
2012-05-09 09:10:20 AM

kidgenius: I still don't understand why all web payment systems online make you specify Visa/MC/Amex, when it's obvious that with about 2 lines of code, they could automatically fill that info in based on the CC you entered. I can't even begin to count the number of times where I accidentally left something at VISA instead of switching to MC and then had to re-enter ALL the information after clicking a submit/buy button. C'mon e-tailers get with it. Amazon seems to be the only people capable of doing this.


my guess is to add one more step of security to throw off automated systems and thieves by making you not only have the number but by adding that additional piece of info.

not a super strong security measure, mind you, but i compare it to "re-enter your email address" or the captcha codes
 
2012-05-09 09:10:44 AM
'geeks are sexy' also owns 'comic book fanboys are lovemachines', 'chunky girls make better lovers' and 'star trek & star wars fans have massive peni'
 
2012-05-09 09:12:15 AM

Cybernetic: kidgenius: I still don't understand why all web payment systems online make you specify Visa/MC/Amex, when it's obvious that with about 2 lines of code, they could automatically fill that info in based on the CC you entered. I can't even begin to count the number of times where I accidentally left something at VISA instead of switching to MC and then had to re-enter ALL the information after clicking a submit/buy button. C'mon e-tailers get with it. Amazon seems to be the only people capable of doing this.

Laziness.

Writing bad code is easier than writing good code. That's why there's so much bad code.


That must be extreme laziness, because I'm not much of a programmer and it would be a simple string call plus if $firstdigit = 3 then $cardtype="AMEX" kinda thing.
 
2012-05-09 09:17:56 AM

Cybernetic: When I had a New Jersey license, I noticed that the last five digits corresponded to the two-digit month and two-digit year of my birth, plus the numeric code for my eye color. But that could be coincidence.


Works on mine too. I use it listening to my scanner to figure out how old the person pulled over is.
 
2012-05-09 09:22:45 AM

bungle_jr: kidgenius: I still don't understand why all web payment systems online make you specify Visa/MC/Amex, when it's obvious that with about 2 lines of code, they could automatically fill that info in based on the CC you entered. I can't even begin to count the number of times where I accidentally left something at VISA instead of switching to MC and then had to re-enter ALL the information after clicking a submit/buy button. C'mon e-tailers get with it. Amazon seems to be the only people capable of doing this.

my guess is to add one more step of security to throw off automated systems and thieves by making you not only have the number but by adding that additional piece of info.

not a super strong security measure, mind you, but i compare it to "re-enter your email address" or the captcha codes


It's not a security measure at all. If I'm a thief and I have the number, then it's really trivial to find out what card it is. Additionally, I can re-enter and change the card type until it goes through.
 
2012-05-09 09:29:00 AM
Knowing what the first digits means is extremely helpful when you are supporting a point of sale system that are accepting credit cards that start with 4, but rejecting those that start with 5.
 
2012-05-09 09:29:31 AM

James!: I can do that for you. Just send your CC info to me in an email (EIP) and I'll tell you what it says. DO NOT post it in the tread, wouldn't want someone shady to get ahold of it.


I see what you did there...
 
2012-05-09 09:32:24 AM

kidgenius: bungle_jr: kidgenius: I still don't understand why all web payment systems online make you specify Visa/MC/Amex, when it's obvious that with about 2 lines of code, they could automatically fill that info in based on the CC you entered. I can't even begin to count the number of times where I accidentally left something at VISA instead of switching to MC and then had to re-enter ALL the information after clicking a submit/buy button. C'mon e-tailers get with it. Amazon seems to be the only people capable of doing this.

my guess is to add one more step of security to throw off automated systems and thieves by making you not only have the number but by adding that additional piece of info.

not a super strong security measure, mind you, but i compare it to "re-enter your email address" or the captcha codes

It's not a security measure at all. If I'm a thief and I have the number, then it's really trivial to find out what card it is. Additionally, I can re-enter and change the card type until it goes through.


as i said, just a guess, and if true, not a strong measure. i really have no knowledge as to the reason for choosing card type
 
2012-05-09 09:33:35 AM

Resolute: Knowing what the first digits means is extremely helpful when you are supporting a point of sale system that are accepting credit cards that start with 4, but rejecting those that start with 5.


for some reason, even though i deal with customers' credit/debit cards all the time, the only way i remember mc starts with 5 is that i have an mc debit card and it starts with 5
 
2012-05-09 09:35:23 AM

austin_millbarge: Here's what I learned years ago...

Visa starts with 4
Mastercard starts with 5
Discover Card starts with a 6 (and it was primarily 6011 years ago)
American Express starts with 37

Might be outdated info, but I thought it was funny when I worked at a call center and people thought I was up to no good because I could "guess" which card they were using by the first digit.


So much this.

You accept credit cards, you should have figured this out a long time ago. Stop asking me what kind of card I am using.

/rage
 
2012-05-09 09:40:00 AM
Wait a minute, this says nothing about how the Freemasons will take over the world and encoded their plans in our credit card numbers.
 
2012-05-09 09:43:09 AM
OK, check this one out:

Fact #1: You can swap any two numbers that are one space away from each other without breaking the checksum. In other words, you could change...

xxxx-xxxx-xxxx-x1x2

...to...

xxxx-xxxx-xxxx-x2x1

...and still have a valid number.

Fact #2: If your credit card is relatively new, there's an excellent chance the card with this altered number exists and has the same expiration date as your card.

Fact #3: If you use this trick to buy a new Ferrari on the Internet and someone calls you on it, all you have to do is say you mistyped the card number.
 
2012-05-09 09:45:12 AM

Arkanaut: Wait a minute, this says nothing about how the Freemasons will take over the world and encoded their plans in our credit card numbers.


It wasn't the Freemasons. It was aliens, as some ancient alien theorists believe.
 
2012-05-09 09:47:46 AM

bungle_jr: as i said, just a guess, and if true, not a strong measure. i really have no knowledge as to the reason for choosing card type


My guess it's just a way to check for typos. Let's say you have MC, but accidentally type in a 4 as first digit, then the edit check will flag the error.

That, or maybe the program is proactive, in that maybe some time in the future, the first digit 'rule' might change.

But I'll just chalk it up as simplistic programming.
Eg
IF mc, then find in list of mc numbers
ELSE IF visa then find in list of visa numbers
etc...
 
2012-05-09 09:52:56 AM

lectos: Arkanaut: Wait a minute, this says nothing about how the Freemasons will take over the world and encoded their plans in our credit card numbers.

It wasn't the Freemasons. It was aliens, as some ancient alien theorists believe.


So the Freemasons are working for the Grays? It's worse than I thought.
 
2012-05-09 09:53:06 AM
The reason you still have to select the card type is because the first digit rule is a rule of thumb, there are exceptions, such as Diners cards that start with a 6.
 
2012-05-09 09:53:26 AM

kidgenius: It's not a security measure at all. If I'm a thief and I have the number, then it's really trivial to find out what card it is. Additionally, I can re-enter and change the card type until it goes through.


But for automated processes, detecting which field is the credit card type field could throw it off.
 
2012-05-09 09:55:30 AM
No. I give not a shiat what the numbers mean.

/Neither a borrower nor a lender be, derpers.
 
2012-05-09 10:02:50 AM
am I missing something or is the "7th and following digits (excluding last digit)..." part not my account number? I've had a bank card where my account number IS the last 7 or 8 numbers, but none of the other card #s correspond with any account #s in my paperwork.
 
2012-05-09 10:02:51 AM

ausfahrk: Fact #1: You can swap any two numbers that are one space away from each other without breaking the checksum. In other words, you could change...

xxxx-xxxx-xxxx-x1x2

...to...

xxxx-xxxx-xxxx-x2x1

...and still have a valid number.


Except in your example you swapped out the checksum digit, which would break the encoding.
 
2012-05-09 10:09:33 AM
Did the adding thing on my two different Mastercards. Final sum came out to 67 on one, 68 on another. I know for a fact they both work. That formula is not accurate.
 
2012-05-09 10:10:17 AM

theorellior: Except in your example you swapped out the checksum digit, which would break the encoding.


Nope, the checksum digit is just to correct the overall number to fit the algorithm. It can be swapped out with any digit that falls in an even digit space (2nd, 4th, 6th, etc)
 
2012-05-09 10:14:05 AM

Hyppy: Nope, the checksum digit is just to correct the overall number to fit the algorithm. It can be swapped out with any digit that falls in an even digit space (2nd, 4th, 6th, etc)


Oh, I guess I misunderstood the concept there.
 
2012-05-09 10:15:28 AM
Now find out if your card has been stolen.
blog.fourpettys.com
 
2012-05-09 10:20:30 AM
I'm surprised this went green... since no one on Fark will admit to having a credit card... or any debt at all for that matter.
 
2012-05-09 10:21:19 AM

Rufus Lee King: HotIgneous Intruder: No. I give not a shiat what the numbers mean.

/Neither a borrower nor a lender be, derpers.

Well, I respect your opinion, there, Polonius, but modern life is more like this:

[27.media.tumblr.com image 500x403]


Yeah, yeah. Without banks allowing people to pay rents, taxes and upkeep on homes and cars all the while calling it "ownership," we'd all be farked.
 
2012-05-09 10:25:50 AM

calgar99: bungle_jr: as i said, just a guess, and if true, not a strong measure. i really have no knowledge as to the reason for choosing card type

Perhaps if a merchant doesn't take a certain type, then it won't confuse the customer when their legitimate credit card info is not accepted by the site? Just a thought.

/4850-9000-0012-4259 (did it work?)


this also could be true. and thanks for your faux number, which even if NOT "faux" couldn't be used without the exp. and also probably the cvv#
 
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