With a rank of 42271 there are many colleges in which you can take the admissions. You can check the previous year cutoff at the official website of the NTA and can know about the opening and closing ranks during the previous year counselling process. There is a certainly a chance that you can get any CSE specialization courses in JOSAA or any one of the rounds of the CSAB special counselling as your rank is reasonably good.

You can take help of our college predictor  which will tell you about all the the colleges you are eligible for admission. The predictor is designed taking several factors in the consideration and thus, gives pretty much accurate list of colleges you are eligible to get admission. The link of the same is mentioned below:

https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

Hope this resolves your query.