You can't do that - no more than you could with a browser.
in reply to Hide real IP
Actually, that's not completely true: you can hide your IP by connecting through a web proxy. But that just oves your problem
one stap away: now the proxy knows your IP. If the website doesn't like what you're doing with ther content and decide to block you, they will simply block the proxy instead of you. That means that not only the administrators of the proxy, but the other users of the proxy will be mad at you.