| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
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| 1 | C D C C C | K1UHF | 40 | 40.82 % | | 40 | 35.71 % | | | 2 | C D C C | K1II | 24 | 24.49 % | | 25 | 22.32 % | | | 3 | C C D C C | AC2PT | 16 | 16.33 % | | 16 | 14.29 % | | | 4 | C C D C | AB1J | 8 | 8.16 % | | 8 | 7.14 % | | | 5 | C C D C C C | KB2URI | 6 | 6.12 % | | 6 | 5.36 % | | | 6 | C D C | W0A | 3 | 3.06 % | | 3 | 2.68 % | | | 7 | C C D | JS8 | 1 | 1.02 % | | 1 | 0.89 % | |
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