Twenty-three, all governed by the Institutes of Technology Act, 1961. The most recent were established in 2015 and 2016. Four of the 23 — IIT Roorkee, IIT (BHU) Varanasi, IIT (ISM) Dhanbad and, in a narrower sense, IIT Guwahati — existed before they were granted IIT status, which is why their founding year and IIT year differ in the table above.