A Virtual Private Network masks your real IP address with one from a remote server, making resolvers useless.
Similar to xResolver, this web-based tool allows users to input a Gamertag to see if a corresponding IP is logged in their database. xbox+gamertag+ip+address+finder+top
A popular network packet sniffer specifically designed for gamers. It intercepts network traffic to display the IPs of everyone currently connected to your party or game session. A Virtual Private Network masks your real IP