Using PING to do a lookup. This is the most common method for using reverse DNS. It's the easiest way to figure out a hostname if all you have is the IP address. PING-a. I.E.: ping-a 192.168.10.5. Might return something like myserver.mydomain.local, and then the normal ping results.irst, it's very important that you understand how a computer does DNS lookups. Most of the mechanisms that rDNS uses are the same. Check out the How DNS Works link in the reference section.