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DNS host names not resolving...

I have Engineer's Toolset 8.0 installed and am trying to do some Network Discovery tasks using both Ping Sweep, DNS Audit and IP Network Browser.  I am trying to get a complete list of all Hosts on the network, along with their IP Addresses and DNS Host Names. 


No matter which tool I use, about half of the HOSTS can not resolve their DNS Host Name.  The server that I am running the Scans from can resolve these hosts just fine via command prompt doing NSLOOKUP but cannot resolve them with PING -A xxx.xxx.xxx.xxx. 


 Can someone please help me figure this out?  I'm about to pull my hair out!


 


Thanks in advance,


austinringding