Getting the list of all ESSID in range in Linux?

Martijn van Oosterhout kleptog at
Thu Dec 6 11:23:26 EST 2001

On Wed, Dec 05, 2001 at 10:14:33AM -0500, LEE, Yui-wah (Clement) wrote:
> Hi,
> Using Orinoco card on Linux, is there a way to get the list of all
> available ESSIDs in range?  I know I can get a single ESSID -- the
> currently associated one -- by SIOCGIWESSID, but I want to get all
> available in range.

I'm not entirely sure, but I seem to remember the ESSID appearing in the raw
tcpdump output of a wireless card. I'm not sure if that's before or after
filtering however.

Ofcourse, this would only pick up active networks on the same frequency...

Martijn van Oosterhout <kleptog at>
> Terrorists can only take my life. Only my government can take my freedom.

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