Dear Aspirant, 143 marks in JEE Mains can fetch you percentile in range of 97.1-99.1. Your AIR might be 21041-22641. At this rank, you can get medium to lower ranked NITS like:-

1.NIT Rourkela

2.NIT Bhopal

3.NIT Nagpur

4.NIT Puducherry

5.NIT Meghalaya

6.NIT Uttarakhand

7.NIT Hamirpur

8.NIT Kurukshetra

9.NiT Silchar

10.NIT Durgapur

11.NIT Agartala

12.NIT Goa

13.NIT Calicut

14.NIT Mizoram

15.NIT Hazratbal

16.NIT Manipur

For Detailed cutoffs, you can check here:- https://engineering.careers360.com/articles/jee-main-cutoff

*Disclaimer:- This is according to previous years' cutoffs.