Use netcut Get all the IP addresses in your LAN?
Inside netcut do a QUICK SCAN: select the Gateway, and click on [Refresh Net].
When you start the NetCut. By the time in your LAN any computer who have any kind of traffic pass through your Lan. the computer will appear in the left Computer List Along with their Hostname(some UNIX system may not appear hostname), MAC address you do not see any computer which does exist in your LAN,you could make it to appear by trying to use that computer's network resource.
eg: Try to visit it at network neighborhood or ping it. If you can not see any computer at all,it seems that you need to click on Change NIC button,and choice other network card than the one you are using now. by click the card name in the list box,then click OK If you still can not see any computer after tried all your network card,you can mail me your network satiation ,OS and network card type to me. Go to http://www.arcai.com click on "ask a question here"
You may also want to see read this http://www.arcai.com/netcut-faq/73-how-do-i-see-who-is-on-my-wireless-network.html