which is the best iit for computer engg. and what should be the jee rank to get into it

As far as I know, it''s IIT  Bombay and the cut-offs are very high. Kind of 1-50 rankers go there

IIT Bombay is the best for CSE because by seeing opening and closing ranks .The opening and closing ranks of CSE IIT Bombay for this year are 1-59 in open category, 8-38 in OBC category, 2-19 in SC category and 3-21 in ST category