Question : the dns that clients use - can we query this somehow?

I need to find out the DNS settings on about 200 machines in our network. Any way to query this automatically rather than walking around to two hundred machines?

Answer : the dns that clients use - can we query this somehow?

if it's a windows domain use psexec logged on as a domain admin

psexec \\* ipconfig /all

will connect to all PC's on the domain and run an IP config command showing you these settings

you could send all the output to a text file if you want too
psexec \\* ipconfig /all >c:\results.txt

download
http://www.microsoft.com/technet/sysinternals/Utilities/PsExec.html