Earlier today I thought I had a URL in my clipboard, but I actually had four 9 digit integers copied from a spreadsheet, which were identification numbers from a proprietary system. Completely unrelated to the task at hand. I pasted it into Firefox and was surprised to find that it actually loaded a page. I've seen dotless decimal notations of IPv4 addresses before, but this long number is something much, much larger.
714687644714805209715128610715964400 (stick a HTTP:// in front)
How does this work? All of the decimal -> IPv4 converters that I've found on the Internet all consider it an invalid input. If I take the IPv4 address that it actually loads, and perform the same calculations to convert it to dotless decimal, I get a vastly smaller number.
What kind of madness is this? It's stumped myself and my coworkers.
Edit: It's back online now.