A WebSDR is a Software-Defined Radio receiver connected to the internet,
allowing many listeners to listen and tune it simultaneously.
SDR technology makes it possible that all listeners tune independently,
and thus listen to different signals;
this is in contrast to the many classical receivers that are already available
via the internet.
More background information is available here.
Questions and comments can be sent to PA3FWM,
the author of the WebSDR software and maintainer of this site;
but please check the frequently asked questions first.
WebSDR servers can register themselves automatically on this site,
leading to the below list of currently active WebSDR servers.
Since September 2018, the Chrome browser occasionally starts to play white noise on WebSDR sites.
As a workaround, muting and unmuting usually restores normal audio.
Chromium engineers are looking into the problem.
Alternatively, use a different browser, like Firefox.
In December 2018, Chrome v71 seems to have fixed this issue!
Currently there are - servers active, with - users and - MHz of radio spectrum.
and covering MHz.
Note: the locations on the map are only accurate to a few km,
because they are derived from the QTH locators.