To find out the IP address of the DNS server to use on your EC2 instance:
- Go to VPC in AWS services and locate the base of your VPC IP address range. For example, 172.31.0.0/16.
- Add 2 to the base IP address range. The resulting IP address is your DNS. For example, base VPC IP address range + 2 = 172.31.0.0 + 2 = 172.31.0.2 = DNS server.