>I am sending an http request to a web server outside of my firewall. I need to include as a parameter the IP address that the web server will see. For example, if I connect the UT, I assume it can log my ip address. What I need to do in my application is find out what that IP address it appears to come from.
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>Sorry if I explained horribly...

Thanks for everybody who posted solutions. I think I might go the whatismyip.org route.