How i find any contact details of my best friend who left to US for higher studies?

I am from India & one of my best friend is doing master in architecture from i don't know which university.I don't know his whereabouts since december 2003.His Email address,cell no. are not working.His father has changed quarter.And worse *** worse even no one from my near friends has any idea about him.So can any one guide me how i can trace him in US ?I had recently get an internet connection so please help what exactly should i do?