District 4
1x3 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| K4SBK | 10 | 55 | — | — | Available |
| K4SBL | 10 | 55 | 2028-10-24 | — | Active (Vanity) |
| K4SBM | 9 | 53 | 2029-07-09 | — | Active (Vanity) |
| K4SBN | 11 | 51 | 2031-10-04 | — | Active (Vanity) |
| K4SBO | 10 | 57 | — | — | Available |
| K4SBP | 10 | 57 | 2028-10-02 | — | Active (Vanity) |
| K4SBQ | 10 | 59 | 2004-10-27 | 2006-10-28 | Available |
| K4SBR | 11 | 53 | 2031-10-05 | — | Active (Vanity) |
| K4SBS | 11 | 51 | 2029-04-21 | — | Active (Vanity) |
| K4SBT | 10 | 49 | 2025-09-11 | — | Active (Vanity) |
| K4SBU | 11 | 53 | — | — | Available |
| K4SBV | 10 | 55 | 2020-10-20 | 2022-10-21 | Available |
| K4SBW | 10 | 55 | 2036-03-05 | — | Active (Vanity) |
| K4SBX | 10 | 57 | — | — | Available |
| K4SBY | 10 | 59 | — | — | Available |
| K4SBZ | 10 | 57 | 2029-01-23 | — | Active (Vanity) |
| K4SCA | 10 | 53 | 2027-02-08 | — | Active (Vanity) |
| K4SCB | 10 | 57 | 2027-12-19 | — | Active (Vanity) |
| K4SCC | 10 | 59 | 2027-05-08 | — | Active (Vanity) |
| K4SCD | 10 | 55 | 2016-08-06 | 2018-08-07 | Available |
| K4SCE | 10 | 49 | 2022-07-13 | 2024-07-14 | Available |
| K4SCF | 10 | 57 | 2018-06-08 | 2020-06-09 | Available |
| K4SCG | 9 | 57 | 2024-12-21 | — | Active (Vanity) |
| K4SCH | 10 | 55 | 2023-04-09 | 2025-04-10 | Available |
| K4SCI | 11 | 51 | 2030-02-21 | — | Active (Vanity) |
| K4SCJ | 11 | 61 | — | — | Available |
| K4SCK | 10 | 57 | 2019-06-15 | 2021-06-16 | Available |
| K4SCL | 10 | 57 | 2021-06-19 | 2023-06-20 | Available |
| K4SCM | 9 | 55 | 2018-01-14 | 2020-01-15 | Available |
| K4SCN | 11 | 53 | 2024-06-21 | 2026-06-22 | Available |
| K4SCO | 10 | 59 | 2033-10-17 | — | Active (Vanity) |
| K4SCP | 10 | 59 | 2030-06-02 | — | Active (Vanity) |
| K4SCQ | 10 | 61 | — | — | Available |
| K4SCR | 11 | 55 | 2029-10-05 | — | Active (Vanity) |
| K4SCS | 11 | 53 | 2025-06-04 | — | Active (Vanity) |
| K4SCT | 10 | 51 | 2030-10-14 | — | Active (Vanity) |
| K4SCU | 11 | 55 | — | — | Available |
| K4SCV | 10 | 57 | 2036-01-28 | — | Active (Vanity) |
| K4SCW | 10 | 57 | 2029-12-27 | — | Active (Vanity) |
| K4SCX | 10 | 59 | 2016-08-26 | 2018-08-27 | Available |
| K4SCY | 10 | 61 | — | — | Available |
| K4SCZ | 10 | 59 | — | — | Available |
| K4SDA | 10 | 49 | 2028-12-30 | — | Active (Vanity) |
| K4SDB | 10 | 53 | 2036-04-24 | — | Active (Vanity) |
| K4SDC | 10 | 55 | 2035-04-12 | — | Active (Vanity) |
| K4SDD | 10 | 51 | 2023-05-07 | 2025-05-08 | Available |
| K4SDE | 10 | 45 | 2034-07-25 | — | Active (Vanity) |
| K4SDF | 10 | 53 | 2032-06-01 | — | Active (Vanity) |
| K4SDG | 9 | 53 | 2034-12-05 | — | Active (Vanity) |
| K4SDH | 10 | 51 | 2024-03-21 | 2026-03-22 | Available |
| K4SDI | 11 | 47 | 2031-04-01 | — | Active (Vanity) |
| K4SDJ | 11 | 57 | 2031-05-11 | — | Active (Vanity) |
| K4SDK | 10 | 53 | 2032-05-07 | — | Active (Vanity) |
| K4SDL | 10 | 53 | 2034-04-22 | — | Active (Vanity) |
| K4SDM | 9 | 51 | 2030-06-13 | — | Active (Vanity) |
| K4SDN | 11 | 49 | 2024-08-13 | 2026-08-14 | Available |
| K4SDO | 10 | 55 | 2034-11-10 | — | Active (Vanity) |
| K4SDP | 10 | 55 | 2027-06-16 | — | Active (Vanity) |
| K4SDQ | 10 | 57 | — | — | Available |
| K4SDR | 11 | 51 | 2029-10-25 | — | Active (Vanity) |
| K4SDS | 11 | 49 | 2034-03-21 | — | Active (Vanity) |
| K4SDT | 10 | 47 | 2024-11-13 | 2026-11-14 | Canceled (grace period) |
| K4SDU | 11 | 51 | — | — | Available |
| K4SDV | 10 | 53 | 2031-03-09 | — | Active (Vanity) |
| K4SDW | 10 | 53 | 2030-04-30 | — | Active (Vanity) |
| K4SDX | 10 | 55 | 2036-02-07 | — | Active (Vanity) |
| K4SDY | 10 | 57 | 2027-02-20 | — | Active |
| K4SDZ | 10 | 55 | 2026-02-06 | — | Active (Vanity) |
| K4SEA | 10 | 43 | 2030-12-19 | — | Active (Vanity) |
| K4SEB | 10 | 47 | 2031-03-13 | — | Active (Vanity) |
| K4SEC | 10 | 49 | 2028-08-22 | — | Active (Vanity) |
| K4SED | 10 | 45 | 2027-08-31 | — | Active (Vanity) |
| K4SEE | 10 | 39 | 2031-10-13 | — | Active (Vanity) |
| K4SEF | 10 | 47 | 2028-07-07 | — | Active (Vanity) |
| K4SEG | 9 | 47 | 2031-01-01 | — | Active (Vanity) |
| K4SEH | 10 | 45 | 2029-03-12 | — | Active (Vanity) |
| K4SEI | 11 | 41 | — | — | Available |
| K4SEJ | 11 | 51 | 2023-06-11 | 2025-06-12 | Available |
| K4SEK | 10 | 47 | 2034-07-17 | — | Active (Vanity) |
| K4SEL | 10 | 47 | 2022-07-24 | 2024-07-25 | Available |
| K4SEM | 9 | 45 | 2028-06-05 | — | Active (Vanity) |
| K4SEN | 11 | 43 | — | — | Available |
| K4SEO | 10 | 49 | — | — | Available |
| K4SEP | 10 | 49 | 2030-09-04 | — | Active (Vanity) |
| K4SEQ | 10 | 51 | 2024-10-24 | 2026-10-25 | Available |
| K4SER | 11 | 45 | 2028-09-23 | — | Active (Vanity) |
| K4SES | 11 | 43 | 2022-03-17 | 2024-03-18 | Available |
| K4SET | 10 | 41 | 2030-07-04 | — | Active (Vanity) |
| K4SEU | 11 | 45 | 2032-07-14 | — | Active |
| K4SEV | 10 | 47 | 2036-09-16 | — | Active (Vanity) |
| K4SEW | 10 | 47 | 2030-06-06 | — | Active (Vanity) |
| K4SEX | 10 | 49 | 2034-07-02 | — | Active |
| K4SEY | 10 | 51 | 2032-05-31 | — | Active (Vanity) |
| K4SEZ | 10 | 49 | 2033-12-06 | — | Active (Vanity) |
| K4SFA | 10 | 51 | 2027-05-01 | — | Active (Vanity) |
| K4SFB | 10 | 55 | 2017-06-19 | 2019-06-20 | Available |
| K4SFC | 10 | 57 | 2024-09-07 | 2026-09-08 | Available |
| K4SFD | 10 | 53 | 2034-03-19 | — | Active (Vanity) |
| K4SFE | 10 | 47 | — | — | Available |
| K4SFF | 10 | 55 | 2027-07-25 | — | Active |