That was it. I was looking at the Airport MAC address and not the Machine's MAC address. Firewire has its own address as well I discovered. I think the confusion also happened because Tiger lists more info than Panther does in the system profiler. My Panther machine does not list any MAC address for the FW card just for the machine itself. I assumed Tiger was the same. So does the machine itself have a unique MAC-like id independent of networking capabilities? I thought each CPU had a unique number burned onto it? This is what I thought the MAC address was. Thanx! > > Also, MAC addresses are unique to each networking capability. So you can > have one for Ethernet, one for AirPort, one for Bluetooth, and maybe even > one for FireWire. Make sure you¹re looking at the right MAC address. > > Eddie Hargreaves >