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Looks very suspicious. For one, why are the visa and mastercard data interleaved? Why isn't there more rows released. Why the hell are there email addresses? Why not leave the last 4 digits of the credit card numbers? and many many more questions like that!

I doubt the validity of this.

Edit: On his twitter account he mentions that its data through a bank and not the credit card companies themselves.

There's no way the data source is either Visa or Mastercard. Each row, which there are less than 2000 of, is non-standard (lower case, varying abbreviations of Street/Lane/etc., partial and full zip codes, varying phone number formats).

Likely a dump of a poorly secured online retailer.

Nothing to see here, move along.

I feel bad for @Reck0r on Twitter, who Reckz0r or Reckz, or Jeremy linked to in the bottom of this paste. He or she obviously meant @Reckz0r https://twitter.com/#!/Reckz0r
A little bit out of the topic but drew my attention: Looks like hackers love to quote from Albert Einstein and write their names instead of Einstein's.
http://kevtownsend.wordpress.com/2012/06/18/reckz0r-hacks-ma...

Interesting to consider. But I do not know much regarding this topic, I am just leaving that link because it is directly related :P

edit.: Anyways, I downloaded that file and it was really just plain texts, nothing to worry about. But seemed suspicious anyway. Why are there email addresses?

"Do you really want to download an unknown file from a Bieber Hacker?" - oh well!!
So we're to believe that he can hack VISA & Mastercard but cannot consistently format a text file and uses double \r\n line delimiters?

Alarm bells are ringing, Willie.

The cc#s/exp/CVC/CVC2 might have been encrypted which is why they aren't included. I doubt this is even from a bank.
per PCI & PA-DSS standards CVC and CVC2 cannot be stored.
There are plenty of companies who don't know that, or haven't been audited yet. When they are audited, they can be out of compliance for months before anything final is done.
Interesting. This data shows up on a Palestinian "hacker" forum [1] on a post dated June 5th.

[1] - http://gaza-hacker.net/cc/showthread-t_38196.html

Reckz0r's tweets say "I just tweeted Reid Hoffman's VISA credit card information, then I had the thought that i'd get suspended..so...nevermind, folks."

From the link above:

"Reed Hofmann..."

Close but no cigar :^P

I think someone is mistaking the whole "Hacker News" title, here.