Quote by kuyt
But this is something fundamental,calculating angular momentum of a system about arbitary points in space.

Yes, it is, and you can answer it by calculating the angular momentum of individual point about the end of the rod, then integrating them along the length of the rod. The result of doing that would be the formula at
http://scienceworld.wolfram.com/phys...nertiaRod.html
that you could get to following the links you were given in tadchem's response.