I ran the command nbtstat -A <IP ADDRESS> at a dos prompt on a Novell 4.11 network with NT 4 clients. Almost all of the machines I polled via their client IP's responded back with the information requested by the command. Several machines did not respond and gave the DOS display "Host not Found" I pinged the offending IP address with the ping command and it responds OK. If I map a drive with the computer name then I can map OK. If I try to map with the IP address, I get an error that displays "Network not Found". I checked the services Workstation and Server are started.