hmm I was intrigued enough to try this for you. However all of the proxy servers it found were no longer working. But it did move me to reply to you. 1) Most networks now include partial host/ip masking, making the use of proxies pretty redundant. 2) I can only assume that the proxy servers that were listed were of the open type, again most networks will check this on connection and Gline (global ban) you for using them.
What network are you wanting to use this for?
Oh and no matter how the network masks your information YOU will always be able to see the true information.

Regards Firestarter