When you type command “nslookup” you might encounter following error stating
Default Server : UnKnown
right click reverse lookup zone and click new zone
create a primary zone (by default it is already selected)
type the network ID (subnet of your network)
Then don’t forget to select the Reverse lookup zone name:
Then click next and keep the default dynamic update type and complete the new zone wizard
Still you might encounter the same error.
Right click on the newly created zone and select “New Pointer (PTR)…”
Enter the ip address of the DNS server and name of the Host and click OK
Now try “nslookup” and you will see the correct server name. And don’t forget to flush DNS (ipconfig /flushdns) if you still find the same result.