|  Callsign structure | # | Callsign structure, C - char, D - digit | Example | Callsigns | % | QSOs | % | 
|---|
 | 1 | C C D C  | AA1K | 270 | 28.57 % |  | 353 | 29.03 % |  |  | 2 | C C D C C  | AA2HJ | 229 | 24.23 % |  | 290 | 23.85 % |  |  | 3 | C D C C  | E7DX | 172 | 18.20 % |  | 249 | 20.48 % |  |  | 4 | C C D C C C  | BD1IIJ | 158 | 16.72 % |  | 181 | 14.88 % |  |  | 5 | C D C C C  | C6AGU | 57 | 6.03 % |  | 65 | 5.35 % |  |  | 6 | C D D C  | A44A | 13 | 1.38 % |  | 14 | 1.15 % |  |  | 7 | D C D C  | 4E1A | 12 | 1.27 % |  | 15 | 1.23 % |  |  | 8 | C D D C C  | E27AZ | 10 | 1.06 % |  | 14 | 1.15 % |  |  | 9 | D C D C C  | 4F3OM | 8 | 0.85 % |  | 14 | 1.15 % |  |  | 10 | C D C  | B4T | 5 | 0.53 % |  | 8 | 0.66 % |  |  | 11 | D C D C C C  | 5B4AOF | 4 | 0.42 % |  | 4 | 0.33 % |  |  | 12 | C D D C C C  | E20HHK | 1 | 0.11 % |  | 2 | 0.16 % |  |  | 13 | C / C C D C  | F/IR7A | 1 | 0.11 % |  | 1 | 0.08 % |  |  | 14 | C C D C C C / D  | JA3GZE/1 | 1 | 0.11 % |  | 1 | 0.08 % |  |  | 15 | C D C C / D  | K0XB/6 | 1 | 0.11 % |  | 1 | 0.08 % |  |  | 16 | C C D / C C D C  | KH0/KC0W | 1 | 0.11 % |  | 2 | 0.16 % |  |  | 17 | C C D C / D  | RV7B/9 | 1 | 0.11 % |  | 1 | 0.08 % |  |  | 18 | C D / C C D C  | V4/WX4M | 1 | 0.11 % |  | 1 | 0.08 % |  |  
  |