Just to add my two cents, I found a nice utility that is free but the name of FASTRESOLVER. It will show you all the IP addresses and the MAC addresses and host names after you type in a range of IP addresses that you want scanned. Example:
192.168.1.1 192.168.1.254
You can also bring up a CMD window (I call it DOS window)
and type "arp -a" and it will display all the IP addresses in your arp cache. If you ping a pc, then do the arp -a it should show up there.
papa4