http://www.youhavedownloaded.com/?q=0.0.0.0
http://www.youhavedownloaded.com/?q=255.255.255.255
http://www.youhavedownloaded.com/?q=192.168.1.1
http://www.youhavedownloaded.com/?q=192.168.2.1
http://www.youhavedownloaded.com/?q=192.168.5.1
[...]
Has this correctly identified anyone's downloading?