Although you might have secured your Wireless network with password, you never know if somebody has hacked into it and using your Wireless network. Wireless Network Watcher is a new freeware utility that scans your wireless network and displays the list of all computers and devices that are currently connected to your network. Just run this portable utility and it will show all the devices that are connected to your wireless network and using it.
After running WNetWatcher, it automatically locates your wireless adapter, and scans your network. After a few seconds, you should start see the list of computers that are currently connected to your network. You can cross check the list of any PCs or devices connected to your network and find out any unauthorized usage.
For every computer or device that is connected to your network, the following information is displayed: IP address, MAC address, the company that manufactured the network card, and optionally the computer name. You can also export the connected devices list into html/xml/csv/text file, or copy the list to the clipboard and then paste into Excel or other spreadsheet application.