Unable to resolve IP adress to my domain name but the other way round works

I am able to resolve my domain name to IP address but not the other way. i.e., unable to resolve IP address to domain name. When I do a nslookup my IP address is getting resolved to the same IP address instead of domain name

mydomain.in is my purchased domain name,3.71.149.103 is the IP address of the AWS ubuntu instanceBelow are the output of nslookup from my PC on internet.

C:\Users\user1>nslookup mydomain.inServer: broadband.actcorp.inAddress: 49.205.75.2

Non-authoritative answer:Name: mydomain.inAddress: 3.71.149.103

C:\Users\user1>nslookup 3.71.149.103Server: broadband.actcorp.inAddress: 49.205.75.2

Name: ec2-3-7-149-103.ap-south-1.compute.amazonaws.comAddress: 3.71.149.103

Can you please guide me how to resolve this issue