Thanks for the suggestion. I've found the System Profiler and under "Network Overview" it reports the following:
Flags 0x8863<Up,Broadcast,b6,Running,Simplex,Multicast>
Ethernet Address 00.30.65.28.03.51
IP 10.0.1.2
Subnet mask 255.255.255.0
Broadcast 10.0.1.255
Any clues there...