SoftPerfect WiFi Guard is a tool you can use to monitor for unauthorized users on your wireless network.

Thankfully, these days most wireless networks are pretty secure, with very few still using the vulnerable WEP. However, that does not make it impossible for an intruder to get onto your wireless network.

For starters, your default wireless key (if you got the router from an ISP) is probably printed on the router somewhere, which is easily read by anyone close enough. A wireless key can also be easily retrieved using a variety of tools from your PC. Of course, brute force attacks are also theoretically possible.

On your network, an unauthorized user could get you into a lot of trouble depending on their activities, or they could decide to monitor your Internet traffic.

SoftPerfect WiFi Guard routinely scans over your wireless network and will alert you if a new, possibly suspicious, device has been located on the network. It can even detect firewalled computers that do not respond to ping.