Hi

Since the concept of percentile got introduced this year , it is difficult to say in terms of percentile. I'll mention the ranks

Since you specifically asked about IIIT I assume you are interested in CSE or IT only.

I'm mentioning the ranks for general category 

COLLEGE                      BRANCH                 CUT OFF Rank

IIIT Delhi                      CSE                       2715(Outside Delhi Region)

IIIT Jabalpur                 CSE                       15888 (gender neutral)

                                    ECE                       23149(gender neutral)

IIIT Allahabad                ECE                       10145

                                    IT                           5700

IIIT Guwahati                 CSE                       25250

                                    ECE                         33193