Wireless Network Watcher

Wireless Network Watcher is the free and portable tool created by Nir Soft.
This tool is used for automatically showing who is connected to your wireless network. All you need to do is run the portable executable file and it automatically starts scanning your IP range, showing you the IP address, device name, MAC address, network adapter company, device information, user text and date of detection with count. In the Advanced Options, you can select which network adapter to use to scan and also manually specifying the IP range.
There is a background scan which continuously scan to automatically discover new devices or computers that connected to the network, without manually pressing on the Start Scanning (play) button. 


I think that the "Device Information" column is pretty useful to amateurs, because it tells you if it is your router or your computer. On a Windows 7 computer, I have tried disabling Ping response, used ZoneAlarm Free Firewall and NetLimiter to block all incoming connections but Wireless Network Watcher is able to detect the computer, although revealing less information.

Download link: HERE