Hello sahil,
As per clear research,the number of seats availabilty for cse in iits are more in ISM danbad follwed by IIT kanpur, which has 92 seats and followed by lowest seats in IIT madras having 30 seats
To sum up, IIT DANBAD having more cse seats and having a good placement oppurtunities to shape out career and has a good way to the desired life
Thank you

Hii Sahil..According to my research, there are around 470 seats in IITs for Mtech (CSE).

I am not sure whether it is cent percent accurate but it is very closest figure.

i am not taking latest IITs into consideration. You can visit the particular college website which you want to join. You will get the exact number over there.

Hope this helps you. All the best.