inSSIDer is an free, award-winning Wi-Fi network scanner application for Windows Vista and Windows XP.
It scans networks within reach of your computer's Wi-Fi antenna, tracks signal strength over time, and determines their security settings (including whether or not they're password-protected).
NetStumbler, the most popular Wi-Fi network scanner, is free, but it hasn't been actively developed for years, and it doesn't work well with Vista or 64 bit OS.
inSSIDer, on the other hand, works like a charm on both Vista and XP, 32 and 64 bit, and it's open-source.
This must-have for hunting down Wi-Fi networks on the road.
Features
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Works with internal Wi-Fi radio
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Wi-Fi network information (SSID, MAC, data rate, signal strength, security, etc)
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Group by Mac Address, SSID, Channel, RSSI and "Time Last Seen."
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Graph the strength of received signal in dBm over time
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Filter access points in an easy to use format.
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Highlight access points for areas with high Wi-Fi concentration.
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Open source (Apache License, Version 2.0)
URL: http://www.metageek.net/products/inssider
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