| Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % |
|---|
| 1 | C D C C | K0AD | 679 | 37.51 % | | 1597 | 40.95 % | | | 2 | C D C C C | K0ALT | 346 | 19.12 % | | 660 | 16.92 % | | | 3 | C C D C | AA0O | 338 | 18.67 % | | 709 | 18.18 % | | | 4 | C C D C C | AA0AI | 242 | 13.37 % | | 467 | 11.97 % | | | 5 | C C D C C C | KA0PQW | 200 | 11.05 % | | 357 | 9.15 % | | | 6 | C C D C C C / D | KB1EFS/2 | 3 | 0.17 % | | 7 | 0.18 % | | | 7 | C D C C / D | K2ZR/4 | 1 | 0.06 % | | 2 | 0.05 % | | | 8 | D C D C C | 4U1WB | 1 | 0.06 % | | 1 | 0.03 % | |
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