On December 22 I posted an offer for free Hilton HHonors Gold status through May 2013.
Hilton’s offer was that any Visa Infinite cardholder could have the status, and they simply verified whether a member was qualified by asking for the first six digits of the Visa Infinite card, which is the Bank Identification Number.
With that as the test, it was fairly easy for folks to Google, Wikipedia is the first page that would come up, and a bank in Russia was the first Visa Infinite card listed. Apparently folks hit that code pretty hard, or at least it was talked about a lot, and so after a few days it and the others listed most obviously on Wikipedia stopped working.
Folks in the comments to my original thread found that other numbers, however, were still working. Commenter Ernie, for instance, offered up first six digits 442394 which appears to still be functional.
Which means you can still sign up for Gold status, yielding free internet, continental (at least) breakfast, and the occasional upgrade plus bonus points and access to elites-only hotel reward redemptions.