NetStumbler is a tool for Windows that allows you to detect Wireless Local Area Networks (WLANs) using 802.11b, 802.11a and 802.11g.

It has many uses:

  • Verify that your network is set up the way you intended.
  • Find locations with poor coverage in your WLAN.
  • Detect other networks that may be causing interference on your network.
  • Detect unauthorized "rogue" access points in your workplace.
  • Help aim directional antennas for long-haul WLAN links.
  • Use it recreationally for WarDriving.