showmyip.com
If you are trying to find the proxy address you are using, you can visit a site such as showmyip.com. When I use vidalia (tor + privoxy), showmyip recognizes that a tor proxy node is being used and displays the ip address and location of the node.
But I guess you are trying to discover the proxy address of someone visiting you? Maybe you should read up on how sites such as the one above discover such things.
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