Sorry - Havde jo helt glemt det her spørgsmål.. ;o) Men her er måden..
Dhcpcmd (dhcpcmd.exe), which lets you view and manage DHCP servers, can list active leases on a scope, create new scopes, add or change scope or global options, and modify serverwide parameters. The command
dhcpcmd 192.168.1.1 enumclients 192.168.20.0 -v
creates a verbose listing of active leases on a particular scope. The enumclients option tells Dhcpcmd to list all active leases on the scope I've specified. In the example, 192.168.1.1 is the DHCP server's IP address, and 192.168.20.0 is the scope subnet on which the command lists active leases. The -v option specifies that I want verbose output.
http://www.dynawell.com/support/ResKit/win2k.asp#Network