Example setup for stealth master configuration using freedns.afraid.org
First make an account on FreeDNS and then go to add backup dns:
The information related to secondary nameservers is available on their website: https://freedns.afraid.org/secondary/instructions.php
NOTE: This still hasn’t given you the ip of ns2.afraid.org. You should poke around on their website to find the relevant information or use the
host command on OpenBSD to get the ip addresses of ns2.afraid.org.
You can set up the configuration at your registrar, depending on your provider. E.g. on NameCheap: