| Callsign structure # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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1 | C C D C C | OK1AY | 47 | 40.17 % | | 74 | 41.81 % | | 2 | C C D C C C | OK1AXB | 43 | 36.75 % | | 59 | 33.33 % | | 3 | C C D C | OK2D | 23 | 19.66 % | | 37 | 20.90 % | | 4 | C C D D C C C C | OL90IARU | 1 | 0.85 % | | 2 | 1.13 % | | 5 | C C / C C D C C | OM/HA5RT | 1 | 0.85 % | | 2 | 1.13 % | | 6 | C C D D D D C C C C C C
OM2015TITANIC | 1 | 0.85 % | | 1 | 0.56 % | | | 7 | C C D D C C C | OM20OTC | 1 | 0.85 % | | 2 | 1.13 % | |
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