If you want to check for ip address of particular person on facebook or orkut or any other social site just invite them for a chat, so that your browser should connect to that system, than only when chat is ON open command prompt type the below command Netstat –an This will show you the connected ip addresses, than from shown ip addresses search for suspicious ip address that is not the local connection address. Local connections normally start from 192.168.1.1 ranging to 192.168.1.255 Other netstat commands: -a Displays all connections and listening ports. -e Displays Ethernet statistics. This may be combined with the -s option. -n Displays addresses and port numbers in numerical form. -p proto Shows connections for the protocol specified by proto; proto may be TCP or UDP. -s option to display per-protocol statistics, proto may be TCP, UDP, or IP. -r Displays the routing table. -s Displays per-protocol statistics. By default, statistics are shown for TCP, UDP and IP; the -p option