What Is NsLookup? Use Our Online Tool To Query DNS Records How to Use the NsLookupTo use the NsLookup tool, you'll need to provide the following: HostThe domain name you want to look up. Once you've provided the requested information, click 'Check Address'. What NsLookup DoesThe NsLookup tool is functionally equivalent to nslookup on the Unix/Linux command-line. NsLookup queries the specified DNS