Hello,

OBC-NCL seats in institutions like NITs and IIITs are pretty much in a lot of demand and thus get filled very quickly. These institutes are prestigious and thus you can very much expect the closing ranks to be very low. You rank of 17k in OBC-NCL is pretty much in the borderline for the tier3 NITs or in your Home State NIT (albeit with lower branch). You can also go for some of the newer IIITs but these IIITs are mostly in temporary campuses and thus would be a huge compromise for the sake of just that "IIIT tag". You might even get some of the good GFTIs though the chances are less. 

Hope it helps, and sorry for answering late. Thank You