There are many ways to get the DNS name of a system. You could do a "ping -a" on the IP address and see if a reverse lookup will provide it for you. You could also run "ipconfig /all" on each machine, which would also show you the host name and fully-qualified domain name. Or, you can use WMI (along with the Scriptomatic tool on the TechNet Script Center site) to programmatically read the value.
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