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What is the best WiFi scanner?

Contributor III
What WiFi scanner tool do you use to see what's going on in your network?
(not planning or heat-map tools)

I use inSSIDer.
There used to be a free version.
I'm not sure if that's available now.
The new/commercial version has an option (dongle) to do a little bit of spectrum analysis.

What does anyone else use?

Contributor II
InSSIDer is still a very good, 'quick check' type of tool.  Since it's free and uses the laptop's built-in NIC, it's always available.  However, using the laptop's built-in WiFi NIC means scanning times are slow (~4 seconds) and readings depend on the quality of the NIC, the OS drivers and the laptop antenna - lots of variables.

I always carry my Ekahau (Proxim) NIC around with me and fire up Ekahau even when I need to do a quick RSSI measurement.  The ability to select which channels to scan and the universality of the NIC in the industry means that the results are consistent and repeatable.  With recent ZD OS and RuckOS versions, Ekahau even shows the number of clients associated to the BSSID and the utilization of the channel.

watch this space for Ekahau as v8.5 brings spectrum analysis and then soon after that there is something new coming to the fold, which will make you rub your hands in excitment - cant tell you as I am bound to secrecy.

In terms of clients and utilisation , they will be offering a cool way to graph clients and utilisation against all AP's captured during a live survey, so you can revisit and look at the values obtained from the IE's.

Contributor III
inSSIDer is very basic and is only really aimed at spectrum occupation.

If you really want to know whats going on in your network then you need to also start looking at packets etc.

For this type of analysis I would recommend using 7Signal, which varies from the low end Micro eye, which is essentially a Raspberry-Pi with a wireless USB dongle:

to the more sophisticated Sapphire Eye, which supports 802.11ac:

You could obviously use other tools for network analysis, but this is easily the best that I have ever had the fortune of using.