Why are you using an application running on the local machine to do this? It doesn't make much sense. This is done through a corporate proxy, generally.
You may edit the
c:windowssystem32driversetchosts
File to resolve a domain name to '127.0.0.1', instead of what it would normally do, to stop it being visible in that fashion. But it's better to do it properly.
Please describe what you're trying to do in more detail.
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