Look it up in the DHCP logs on your home router. The MAC address for the device is the station address that it uses to register to MBW if I recall correctly, so it shouldn't be too hard to find it.
If you are running a Windows PC and a simple home router, this trick *may* work as well:
1) Open an MS-DOS prompt
2) Type "ipconfig" (without the quotes) and look for the line showing your IP or IPv4 address. It may say something like "192.168.1.104".
3) Drop the right-most number, and replace it with ".255".
4) Type "ping 192.168.1.255" (or whatever you came up with in #3 above).
5) There will be no answer. Hit CTRL+C after about 5 seconds.
6) Type "arp -a" to display all of the IP and MAC addresses on your local network segment.
7) The MAC address that starts "24-C8-6E" is probably the bridge you are searching for.
No guarantee that this will work, since it makes assumptions about your local subnet mask that are likely to be correct but not a certainty.....
If you are running a Windows PC and a simple home router, this trick *may* work as well:
1) Open an MS-DOS prompt
2) Type "ipconfig" (without the quotes) and look for the line showing your IP or IPv4 address. It may say something like "192.168.1.104".
3) Drop the right-most number, and replace it with ".255".
4) Type "ping 192.168.1.255" (or whatever you came up with in #3 above).
5) There will be no answer. Hit CTRL+C after about 5 seconds.
6) Type "arp -a" to display all of the IP and MAC addresses on your local network segment.
7) The MAC address that starts "24-C8-6E" is probably the bridge you are searching for.
No guarantee that this will work, since it makes assumptions about your local subnet mask that are likely to be correct but not a certainty.....