NetStumbler
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NetStumbler is a tool for Windows that facilitates detection of Wireless LANs using the 802.11b, 802.11a and 802.11g WLAN standards. A trimmed-down version called MiniStumbler is available for Windows CE.
The program is commonly used for:
- Wardriving
- Verifying network configurations
- Finding locations with poor coverage in one's WLAN
- Detecting causes of wireless inteference
- Detecting unauthorized ("rogue") access points
- Aiming directional antennas for long-haul WLAN links
NetStumbler's author maintains an occasionally-updated web site where you can download the software, for more frequently updated information and wireless news the other main site is the place. There is also a very active Wi-Fi Forum focused on NetStumbler and Wardriving.