Hello everybody, today I’m going to teach you how to fix a very common problem. When you have established a new Domain Controller, by default, you will get an error notification when you try running “NSLOOKUP” from any computer in your domain,. I’m sure many of you have experienced this. It happens because you have not created a Reverse Lookup Zone (PTR record).
As described in my old article (DNS records explanation) in order to work with NSLOOKUP and get all the correct queries and information, you should create the PTR record and point it to your DC.
The Error is:
Default Server unknown
and IP :1:
Go to “Reverse Lookup Zone ” and Create new Zone:
Allow “Primary Zone and Store the Zone in AD” and proceed:
Allow “IPv4 Reverse Lookup Zone“:
You have to type your ID Network (Subnet):
Allow Dynamic Updates (Automatically DNS records registration):
If your DC didn’t create the PTR record, please go to “Reverse Lookup Zone” and create the record manually with the following steps:
Select your DC’s record
Another way to create this record is
Allow PTR record of DC’s record through your zone:
Alright, so the purpose of this article was to show you how to fix the “Default server unknown nslookup” issue but we also alloweded automatic PTR registration on our DNS, the next NSLOOK you run will be like this: