1) Radio amateurs of the first categories: R0AA-R9ZZ (except for the suffix HQ); RA0AA-RZ9ZZ (with the exception of prefixes RB0-RB9, RE0-RE9, RH-RH9, RI0-RI9, RP0-RP9, RR0-RR9 and RS0-RS9); UA0AA-UI9ZZ; RA0A-RZ9Z (with the exception of prefixes RB0-RB9, RE0-RE9, RH0-RH9, RI0-RI9, RP0-RP9, RR0-RR9 and RS0-RS9); UA0A-UI9Z;
2) Radio amateurs of the second categories: R0AAA-R9ZZZ (except for the suffix SRR); RA0AAA-RZ9ZZZ (with the exception of prefixes RB0-RB9, RE0-RE9, RH0-RH9, RI0-RI9, RP0-RP9, RR0-RR9 and RS0-RS9); UA0AAA-UA9ZZZ;
3) Radio amateurs of the third categories: UB0AAA-UD9ZZZ; UF0AAA-UG9ZZZ;
4) Radio amateurs of the fourth category: UE0AAA-UE9ZZZ; UH0AAA-UI9ZZZ;
5) Repeaters: RR0AA – RR9ZZ; RR0AAA – RR9ZZZ;
6) Beacons: RB0AA – RB9ZZ;
7) Satellites: RS00S-RS99S;
8) Expedition to space objects: RS00ISS – RS99ISS;
9) Polar stations, drifting in the ice of the Arctic Ocean (the numbers correspond to the number of polar station): R00SP – R99SP;
10) Amateur radio stations operating from Antarctica and Islands: RI prefix;
11) The activities of the Russian Amateur Radio Union: R0SRR – R9SRR; R0HQ – R9HQ; RAEM (only events dedicated to Ernst Krenkel);
12) The Memorial «Victory»: RP prefix;
13) Other special call signs: RA00A-RZ99Z, RA00AA-RZ99ZZ, RA00AAA-RZ99ZZZ, RA000A-RZ999Z, RA000AA-RZ999ZZ (with the exception of prefixes RB0–RB9, RI0–RI9, RP0–RP9, RR0–RR9 and RS0–RS9); R0AAAA-R9ZZZZ, R00AAA-R99ZZZ, R000A-R999Z, R000AA-R999ZZ, R0000A-R9999Z;
14) Other special call signs in the sphere of radio sports: R0A-R9Z; R00A-R99Z; R00AA-R99ZZ (with the exception of block R00SP-R99SP);
15) World War II veterans: U1-4, U6, U9-0 prefixes (sometimes in the series of prefixes R1-4, R6, R9-0); Remarks. U4MIR – Alexander Volkov, cosmonaut (astronaut);
16) Temporary stay of the foreign radio amateurs: R0-R9/Home Call.
