Dear Aspirant,

It is all relative to the difficulty of the question paper and the number of seats available. However, in general anything above AIR 6000 is a sure for getting a seat in at least one IIT. To get into top IITs like Delhi, Bombay, you may be needing a rank above 4000 AIR.

There might be some changes in these figures, however, you get the picture.

Hope this helps. Thank you.