News
World Amateur Radio Day **Updated**
2025-04-18
On the 18 April every year the radioamateur community world wide celebrates the World Amateur Radio Day.
The date was chosen because it marks the day IARU - International Amateur Radio Union was founded (18 Apr 1925), precisely 100 years ago.
During this month many SES (Special Event Stations) are on the air using 100IARU sufix commemorating the event.
Please see a list below of the call signs QRV via QO-100 and the presumed grid square (subject to change/further confirmation).
- 5P0WARD/H JN45
- 8A100IARU OI33
- 9A100IARU
- AO100IARU
- AT9WAR MJ89
- B100IARU NN33
- CN100HR IM63
- CR5IARU IM58
- E7100IARU
- HB100IARU JN36
- HS100IARU OK03
- LZ100IARU KN33
- OH100IARU KP52
- OL100A JO70
- OL100IARU JN69
- OQ100I JO10
- OR100I
- OR100R JO20
- OS100A JO20
- OS100R JO11
- R100IARU KO85
- TC3WRD KM36
- TM100IARU JN36
- S5100IARU JN76
- SZ100IARU KM17
- TC3WRD KM38
- VU1IARU MK82
- YL100IARU KO27
- YQ100IARU KN15
- YO100IARU
If a callsign is missing or if a grid is incorrect, please let us know using the Contact form.
TNX Bernd, DL5NON; Vilnis, YL2KF; Florian, DF2ET; David, OK6DJ