Open ur DOS prompt..By jus going through START>RUN>(type cmd in a given Box)
cd\ (for going to root)
(wait for a while)
Some thing like this will apear
PROTO LOCAL ADDRESS FOREIGN ADDRESS STATE
TCP 22.214.171.124:1863 126.96.36.199:1099 ESTABLISHED
HTTP 188.8.131.52:1560 184.108.40.206:1054 ESTABLISHED
TCP 220.127.116.11:1501 18.104.22.168:1068 ESTABLISHED
Note: Last four digit will be keep on changing so donot need to note that.
The field we needed is (FOREGIN ADDRESS).
LOCAL ADDRESS is ur IP address.
Then just place this IP to IP tracer and fing it out his/her IPS....