Hey Praveen, 

The number of seats availability for round 2 in IIIT Bangalore depends on the total number of seats alloted in first round and the total vacant seats after the seat allotment process after completion of round 1. Depending on that, the vacant or unfilled seats are alloted for seat distribution and allocation in subsequent rounds. So there is not a fixed data about it but still you could get the stats if available in some cases on the official website. So keep checking that.

Hope it helped..