Probably the wrong forum for this. Try an app like bonjour browser or angry IP scanner. Check the documentation to see if it ships with a default network configuration.
Depending on your router, there may be a DHCP table or list of devices there too.
On an iPhone: WiFiman is a nice tool...on the Discovery tab, shows every device on the network (wired and wireless)....assuming this network has wifi to join. I'm sure there are other tools too.
Probably the wrong forum for this. Try an app like bonjour browser or angry IP scanner. Check the documentation to see if it ships with a default network configuration.