Is there a way in Server 2008 to know what IP addresses are in use? I currently use DHCP and some reservations etc. However, what if someone with a laptop just plugged into the network and gave itself a STATIC IP. Is there a way in R2, I can check a list of all IP's in use? Then if I saw some device using an address outside my defined DHCP range I could question what this computer was and take action from there.