Windows

First, in order for NSLookup to work properly, you need to set up and configure a reverse lookup zone. This is created from the DNS snap-in. It is a simple wizard.
During the dcpromo of Active Directory, you are prompted to install DNS but it doesnt install a reverse lookup zone.

Another thing to check is to make sure you have the appropriate DNS Server configured in either DHCP or manually in you Network Connections. Once you have done this you should have no problems using NSLookup.

This is from Microsoft ADS training kit.

Reverse Lookup Zones
A reverse lookup zone enables reverse lookup queries. Reverse lookup zones are not required. However, a reverse lookup zone is required to run troubleshooting tools, such as NSLOOKUP,and to record a name instead of an IP address in Internet Information Services (IIS) log files.


To create a new reverse lookup zone


Click Start, point to Programs, point to Administrative Tools, and then click DNS.


Expand the DNS server.


Right-click the Reverse Lookup Zone folder and click New Zone. The New Zone Wizard guides you through the process of setting up a reverse lookup zone. The wizard presents the following configuration options: Zone Type, Reverse Lookup Zone, Zone File, and Master DNS Servers.

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