| Number | Prefix | Country | Continent | Callsign |
| 1 | DM | German Dem. Rep. | EU | DM4YUG |
| 2 | KH5K | Kingman Reef | OC | K5K |
| 3 | OK/D | Czechoslovakia | EU | OK3UL |
| 4 | PJ2/D | Netherland Antilles | SA | PJ2AAX |
| 5 | PJ7/D | Saint Maarten & Saba | NA | PJ8/DL5LYM |
| 6 | R1M | Malyj Vysotskij Island | EU | R1MVI |
| 7 | ZS9 | Walvis Bay | AF | ZS9Z |
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