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The wpa_supplicant.conf file can have parameters freq_list and scan_freq. How do I find what are the possible values for either or both of these parameters? 

freq_list=5500 5520 ... 

scan_freq=5500 5520 ...

I found a tool that can scan surrounding access points and return their frequencies: sudo iwlist scanning | grep -A 3 Address

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As the comments in the example wpa_supplicant.conf say, where you probably found it, the frequency is in MHz.

Allowed frequencies depend on your country. Wikipedia has a list of channels with frequencies by country.

The command 

iw reg get

prints out what the kernel thinks are the current admissible regulatory ranges for your WLAN devices.

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  • Thanks for this. Is there a tool that can scan surrounding access points and return their frequencies?
    – mcarans
    Commented Jan 29, 2018 at 9:11
  • I found a tool that can scan surrounding access points and return their frequencies: sudo iwlist scanning
    – mcarans
    Commented Jan 29, 2018 at 9:21
  • iwlist is the old tool, try iw wlan0 scan (does new scan) and iw wlan0 scan dump (uses known values). While you are at it, also try iw wlan0 station dump.
    – dirkt
    Commented Jan 29, 2018 at 17:19

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