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.
WebSDR servers can register themselves automatically on this site, leading to the following list of currently active WebSDR servers:
Currently there are 28 servers active, with 120 users and 8856 kHz of radio spectrum.
Location and URL Frequency range Antenna
WebSDR from Weert, The Netherlands
http://www.nachtuilen.net/
JO21UG; 36 users
3.593 - 3.785 MHz Wellbrook loop
7.014 - 7.206 MHz
W4AX 160, 80, 40, 20 and 30M. Atlanta, GA, USA
http://W4AX.com/
EM74uc; 10 users
1.799 - 1.991 MHz Inverted L at 100 ft.
3.549 - 3.741 MHz Clifton Labs Active Antenna and Norton Preamp
7.018 - 7.210 MHz
14.046 - 14.238 MHz
10.064 - 10.256 MHz
Receptor SDR Brasileiro em Sorocaba, SP - Brasil
http://sdr.dyndns.org/
GG66GL; 9 users
7.060 - 7.252 MHz Dipolo 40m
7.002 - 7.098 MHz
3.599 - 3.791 MHz Dipolo 80m
14.200 - 14.296 MHz Delta-Loop Vert
28.374 - 28.566 MHz Dipolo 10m
SP3PGX ham radio club at University of Zielona Gora, Poland
http://websdr.sp3pgx.uz.zgora.pl:8901/
JO71SW; 8 users
0.000 - 0.192 MHz random wire
1.827 - 1.923 MHz
3.638 - 3.734 MHz
7.005 - 7.197 MHz
10.107 - 10.155 MHz
14.128 - 14.176 MHz
3 Softrock Lite II Receivers located in Bucharest, Romania.
http://websdr.yo3ggx.ro:8765/
KN34BK ; 11 users
3.590 - 3.782 MHz Carolina Windom (132')
6.998 - 7.190 MHz
10.075 - 10.171 MHz
13.947 - 14.139 MHz
Russia, Moscow region, Protvino: RV3DLX and RN3DKT
http://rn3dkt.ru/
ko84ou; 7 users
6.985 - 7.177 MHz Doble bazooka
3.510 - 3.702 MHz Long wire
1.796 - 1.988 MHz
OE4RLC, OE3DUS, AMRS Testreceiver, Markt Allhau, SE Austria
http://www.websdr.at/
JN87bh; 5 users
3.608 - 3.800 MHz Windom 160-10 m (160-80-40-20-17-12-10 m) 76m long 30m above ground N-S oriented
WEB SDR in Estonia
http://websdr.ham.ee:8901/
KO18UO; 4 users
3.656 - 3.704 MHz 80m dipole
webSDR @ School centre Novo mesto
http://websdr.sc-nm.si/
JN75NT; 5 users
3.542 - 3.734 MHz funny dipole
6.950 - 7.142 MHz
14.043 - 14.235 MHz
144.176 - 144.368 MHz
WEB SDR in Hungary.
http://www.websdr.hu:8090/
JN97HG; 2 users
3.538 - 3.730 MHz long wire (38 meter)
6.984 - 7.176 MHz
First receiver at University of Eindhoven, NL by Maxwell Stichting
http://lindsey.esrac.ele.tue.nl/
JO21rl; 5 users
-0.024 - 0.024 MHz satellite tracking system
28.354 - 28.546 MHz 3elm SteppIR bi-derctional @68 agl
7.000 - 7.192 MHz dipole @68 agl
Receiver in Kingston, Rhode Island, USA near the ocean - SoftRock.
http://shipwreck.yi.org:8901/
FN41fl; 1 user
7.006 - 7.102 MHz 6BTV or shortened vertical dipole on balcony
Receiver at IDeTIC, University of Las Palmas de Gran Canaria.
http://websdr.idetic.ulpgc.es:8901/
IL28GB; 2 users
6.960 - 7.152 MHz 12m-long vertical antenna
websdr.pa3weg.nl at Delfi-C3 groundstation
http://websdr.pa3weg.nl/
JO21ex; 3 users
0.000 - 0.024 MHz Nordholt active antenna
0.476 - 0.524 MHz
WebSDR from Radio.it project of CSP - Softrock Ensemble RX II
http://websdr.radio.it/
JN35UC; 0 users
7.002 - 7.098 MHz diamond w-8010 dipole (band: 3.5-28.0MHz)
HB9FX Remote Site Hochwacht 644 m asl
http://websdr.fvzr.ch:8901/
JN37XH; 4 users
1.800 - 1.992 MHz 160m full size dipole
10368.070 - 10368.166 MHz 16dB unidirectional
Softrock 6 20m receiver located in Russia, Tyumen (West Siberia).
http://websdr.electrosystem.ru:8081/
MO27RD; 0 users
13.995 - 14.091 MHz Antenna-dipole at a height of 8 meters, talking the northwest and southeast.
Receiver in Czech republic at the Doubravka castle
http://websdr.hrad-doubravka.cz/
JO60WP; 3 users
1.809 - 2.001 MHz LW
3.669 - 3.861 MHz funny dipole
K2SDR Sea Girt, New Jersey - 3 Softrock Receivers - CW portion
http://71.172.237.88:8901/
FN20XD; 1 user
3.473 - 3.569 MHz 6BTV HF Multicoupler
7.008 - 7.104 MHz
13.998 - 14.094 MHz
http://websdr.fmotta.net/
GG66OE; 1 user
7.051 - 7.099 MHz G5RV
LU5DNP - Saladillo City - Bs. As. R.Argentina
http://190.247.127.57/
GF04CI; 0 users
7.067 - 7.163 MHz Doble Bazooka
WebSDR @ KIT
http://auk-server.amateurfunk.uni-karlsruhe.de:8901/
JN49EA; 1 user
7.004 - 7.196 MHz funny wire
KC7IGT, RENTON,WA USA (West Coast)
http://kc7igt.com/
CN87vk; 0 users
7.014 - 7.206 MHz G5RV direction North to South.
Vancouver, Canada - VE7UBC - SoftRock SI570 on 20m
http://websdr.ubc.ca/
CN89JG; 1 user
14.104 - 14.296 MHz Tri-Band Yagi
Receiver at K7UEB, Walla Walla University.
http://outside.wallawalla.edu:8901/
DN06tb; 0 users
7.007 - 7.103 MHz 4BTV vertical on the roof (30 feet)
14.007 - 14.103 MHz Hustler 4BTV Vertical
14.102 - 14.198 MHz
2 Softrock Lite II Receivers located in Breaza (PH), Romania.
http://websdr2.yo3ggx.ro/
KN25te; 0 users
3.638 - 3.734 MHz LW (40m) E-W oriented
7.007 - 7.103 MHz
DS5TUK in Daegu Korea, HomeBrew SDR Station.
http://websdr.elechomebrew.com/
PM45HU; 1 user
7.002 - 7.098 MHz Welbrook style Homebrew Active DeltaLoop Antenna
25 meter radio telescope near Dwingeloo, The Netherlands
http://websdr.camras.nl:8901/
JO32ET74nv; 0 users
431.982 - 432.078 MHz recording made with 25 m dish
1295.975 - 1296.071 MHz
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