Just open up a command prompt (Start > Run > CMD)
and then copy and paste this code:
- Code: Select all
for /L %i in (1,1,255) do @ping -n 1 -w 25 192.168.1.%i | arp -a | findstr /R /C:"192.168.1.%i[ ]
obviously if your network is 192.168.0 or 192.168.2 etc. you'll have to make the appropriate change to the hardcoded portions of the script.
Cisco owns a number of Vendor MAC IDs (the first 6 of any MAC address) 00-00-0C, 00-06-7C, 00-06-C1, 00-07-D1, there's a fairly complete list here: http://www.cavebear.com/archive/cavebea ... endor.html but it's really only worth your time to look if you have more than a handful of devices on your network.
Find the one that seems out of place, and connect to it with your browser window.