There are 31 NITs in India that offers admissions based on the performance in the national level entrance exam Jee Main. The opening and closing rank for each branch in NITs and the rank obtained bye the student in Jee Mains decides which admission in NITs.

Below link will help you with the details related to all NITs and other institutes which offers admission on the basis of Jee Mains score.

https://engineering.careers360.com/articles/jee-main-participating-institutes

Hope the information provided will help you to decide your branch and dream NITs.