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Network Stumbler (also known as NetStumbler) is a tool for Windows that facilitates detection of Wireless LANs using the 802.11b, 802.11a and 802.11g WLAN standards. It runs on Microsoft Windows operating systems from Windows 2000 to Windows XP. A trimmed-down version called MiniStumbler is available for the handheld Windows CE operating system.

The program is commonly used for:

  • Wardriving
  • Verifying network configurations
  • Finding locations with poor coverage in a WLAN
  • Detecting causes of wireless interference
  • Detecting unauthorized ("rogue") access points
  • Aiming directional antennas for long-haul WLAN links

NetStumbler's author, Marius Milner, maintains the occasionally-updated website where you can download the software. Another website,, has more frequently updated information and wireless news.

Apparently, the project has been inactive for a while now, so it is unlikely that there will be a new version.


  • Inssider was created as an open-source alternative to Network Stumbler for the current generation of Windows operating system
  • Kismet

Netstumbler under Vista

External links