Virtual machine?
Have you checked the MAC address against a manufacturer database?
Or WiFi and Ethernet connected?
mac = Apple. The latter sounds most plausible.
What Ant says, but you can even present multiple IPs on one interface. You only ever have one MAC per interface, though until a VM comes along which could have it'a own MAC, though usually they NAT with the host by default for simplicity
Usually a VM has it's own host name. Pretty sure it's ethernet & WiFi. I'll know for sure in a couple of hours.
Oh, if you're grouping by hostname then that's what it'll be unless he's got two Ethernet NICs
Well that's one mystery solved, but did we ever find out what happened to Ian?
And he would have gotten away with it too, if it wasn't for those meddling kids and that stupid talking dog!
Are you saying that Ian is actually Old Man Withers from the Amusement Arcade?