OO thru OT - Vanity calls/Special Events
| OO-OTna | All Belgian HAREC amateur stations have the privilige, as of 2006, to request a second Vanity call in the format of OOxn, OPxn, OQxn, ORxn, OSxn and OTxn as far as they don't conflict with other special calls. The calls can be found in the ON-line Callbook |
| OO6P | HB0/OO6P-HB0/ON4IPA will be activated from Liechtenstein during the period June 28th 2008 till July 5th 2008. For more information visit the website http://www.on6om.be/hb0-oo6p/ |
OO - 175 Years of Independence
| OOnaa | All Belgian amateur stations having a two letter suffix have the privilege to change the ON-prefix by OO during 2005 to celebrate the 175th independence of Belgium |
| OOnaaa | All Belgian amateur stations having a three letter suffix have the privilege to change the ON-prefix by OO during 2005 to celebrate the 175th independence of Belgium |
ON - Special Event Stations
| ON4CLM | Canadian Liberation March. More information can be found at the ON4CLM website |
| ON4CWM | Canadian War Museum. Each year a ceremony is held at the Canadian Military Cemetery to commemorate the Liberation by Canadians. It has been a custom for the Official Belgian Radio Amateurs to participate by broadcasting from the radio room at the Canadian War Museum. The Special Event Station ON4 Canadian War Museum is then visited all over the world. More information can be found at the ON4CWM website |
| ON4OSLN | The special 4-letter prefix call ON4OSLN is being used during the International Lighthouse and Lightship week-end from the Lighthouse of Nieuwpoort. Also this year, the station will be active for 48 hours during the weekend of 20 - 21 August. For more information, check http://users.telenet.be/on4cjk/vuurtoren/index.html |
| ON4USA | The station is activated by the GDV team (since 1988) the second week-end of September from the American Military Cemetery WW II at Henri-Chapelle. ON4USA will honor the memory of all those brave men who gave their lives between 1939 and up to 1945, so that Europe might recover its freedom. |
| ON60CLM | Will be on air for the 23rd time during 2004 from November 5th till November 9th. For more information visit ON4CLM |
| ON70REDSTAR | The radio club OSA in Antwerpen (member of the UBA) will activate the special call sign ON70REDSTARLINE during 2008. A special QSL card will be available via ON4OSA, either via bureau or direct. (QRZ.COM). For more information visit the website. |
| ON8CE | The station is being used during the Castle of Europe Day. All QSL via ON7VZ |
| ON9BD | The call is being used by the Museum Lightship Westhinder
III in Antwerp. ARLHS Nr. BEL-027 - JO21EF - QSL Manager is ON4GDB More information on http://www.on4osa.org/ |
OQ - Birth of Princess Elisabeth
| OQnaa | All Belgian amateur stations having a two letter suffix have the privilege to change the ON-prefix by OQ for the Royal birth of Princess Elisabeth between October 25th and December 31st 2001. Read more about the OQ-Award |
| OQnaaa | All Belgian amateur stations having a three letter suffix have the privilege to change the ON-prefix by OQ for the Royal birth of Princess Elisabeth between October 25th and December 31st 2001 Read more about the OQ-Award |
OR - Special Event Stations
| OR0OST | Belgian Maritime Amateur Radio Society (BMARS) |
| ORna | All Belgian amateur stations having a two letter suffix will have the privilege to change the ON-prefix by OR during contests in the period of May 18th and July 11th 2002. |
| ORnaa | All Belgian amateur stations having a three letter suffix will have the privilege to change the ON-prefix by OR during contests in the period of May 18th and July 11th 2002. |
OS - Special Event Stations
| OS4OSA | Will be on-air between July 1st and July 12th 2001, for celebrating the Antwerp sail race "Cutty Sark Tall Ships's Race". The station can be contacted on both 17 and 20m in CW and SSB. |
| OSnaa | All Flemish amateur stations having a two letter suffix will have the privilege to change the ON-prefix by OS during contests in the period of May 18th and July 11th 2002 remembering the 700th anniversary of "The Battle of the Golden Spurs". |
| OSnaaa | All Flemish amateur stations having a three letter suffix will have the privilege to change the ON-prefix by OS during contests in the period of May 18th and July 11th 2002 remembering the 700th anniversary of "The Battle of the Golden Spurs". |
OT - Royal Festivities Calls
| OTnaa | All Belgian amateur stations having a two letter suffix had the privilege to change the ON-prefix by OT for the Royal wedding. |
| OTnaaa | All Belgian amateur stations having a three letter suffix had the privilege to change the ON-prefix by OT for the Royal wedding. |
OT - High Power Contest Calls
| Callsign | Remark | Clubcall |
| OTnA | Contest Call LIR | ON7LR |
| OTnB | Contest Call DST | ON4DST |
| OTnC | Contest Call ACC | ON7AR |
| OTnD | Contest Call HOB | ON4AOB |
| OTnE | Contest Call DRC | ON4ARC |
| OTnG | Contest Call LUS | ON7LU |
| OTnH | Contest Call AST | ON7SA |
| OTnK | Contest Call HRT | ON4HRT |
| OTnL | Contest Call NOL | ON5LL |
| OTnM | Contest Call WLD | ON6WL |
| OTnN | Contest Call NOK | ON4NOK |
| OTnO | Contest Call OSB | ON6BR |
| OTnP | Contest Call BDX | ON4IF |
| OTnR | Contest Call KTK | ON6CK |
| OTnT | Contest Call TLS | ON6MS |
| OTnU | Contest Call TRA | ON7TR |
| OTnX | Contest Call Liege | ON6DP |
| OTnZ | Contest Call NOB | ON4HRA |
| Note: | List of available OT calls is provided by the BIPT and might change from year to year. Clubcalls are added by Belgian HAM Radio. |