The dotless IP address, also called the "decimal address", can be easily
calculated with this formula:
decimal=aaa*16777216+bbb*65536+ccc*256+ddd
If you get a url like http://3327655938/?key=5?index=beesky.rocks.com, just stick it in the first set of numbers, in this case 3327655938, into this form below to find out who it's really from.
The fact that IE and Netscape accept dotless IP's as a valid addresses is a pretty serious little bug. After you are done playing around please go to http://www.microsoft.com../windows/Ie/security/dotless.asp for more info and the Microsoft patch.
The C program used in the cgi-script above is a modified version from http://www.norad.net