Hey Akshara,

Congratulations on your rank.

Here is enlisted the NITs and IITs located in South India-

NITs:

• National Institute of Technology Tiruchirappalli
• National Institute of Technology Karnataka Surathkal
• National Institute of Technology Warangal
• National Institute of Technology Calicut
• National Institute of Technology Andhra Pradesh

IITs:

• Indian Institute of Technology Madras
• Indian Institute of Technology Hyderabad
• Indian Institute of Technology Tirupati
• Indian Institute of Technology Palakkad
• Indian Institute of Technology Dharwad

Considering your CRL, it would be tough for you to get a seat in any of those mentioned above. But you are on a greater hand with your OBC rank- considering that rank, it is extremely possible that you can secure a seat in any of the NITs mentioned above, judging from previous years' cutoffs in the CSE discipline in the NITs.

Here you can find the cutoffs for the CSE discipline in all NITs across the country:

https://engineering.careers360.com/articles/nits-cutoff-for-b-tech-computer-science-and-engineering

Hope that helped, best of luck :)