District 4
1x3 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| K4UKZ | 10 | 59 | — | — | Available |
| K4ULA | 10 | 53 | 2014-05-31 | 2016-06-01 | Available |
| K4ULB | 10 | 57 | — | — | Available |
| K4ULC | 10 | 59 | — | — | Available |
| K4ULD | 10 | 55 | 2028-09-09 | — | Active (Vanity) |
| K4ULE | 10 | 49 | 2035-12-22 | — | Active (Vanity) |
| K4ULF | 10 | 57 | 2029-07-02 | — | Active (Vanity) |
| K4ULG | 9 | 57 | — | — | Available |
| K4ULH | 10 | 55 | — | — | Available |
| K4ULI | 11 | 51 | — | — | Available |
| K4ULJ | 11 | 61 | 2022-04-13 | 2024-04-14 | Available |
| K4ULK | 10 | 57 | — | — | Available |
| K4ULL | 10 | 57 | 2018-12-28 | 2020-12-29 | Available |
| K4ULM | 9 | 55 | — | — | Available |
| K4ULN | 11 | 53 | — | — | Available |
| K4ULO | 10 | 59 | — | — | Available |
| K4ULP | 10 | 59 | 2034-12-07 | — | Active |
| K4ULQ | 10 | 61 | — | — | Available |
| K4ULR | 11 | 55 | — | — | Available |
| K4ULS | 11 | 53 | — | — | Available |
| K4ULT | 10 | 51 | 2006-06-06 | 2008-06-07 | Available |
| K4ULU | 11 | 55 | — | — | Available |
| K4ULV | 10 | 57 | 2025-07-06 | — | Active |
| K4ULW | 10 | 57 | 2034-09-20 | — | Active (Vanity) |
| K4ULX | 10 | 59 | — | — | Available |
| K4ULY | 10 | 61 | — | — | Available |
| K4ULZ | 10 | 59 | — | — | Available |
| K4UMA | 9 | 51 | 2029-12-17 | — | Active (Vanity) |
| K4UMB | 9 | 55 | — | — | Available |
| K4UMC | 9 | 57 | 2024-09-26 | 2026-09-27 | Available |
| K4UMD | 9 | 53 | 2025-08-15 | — | Active (Vanity) |
| K4UME | 9 | 47 | 2036-04-22 | — | Active |
| K4UMF | 9 | 55 | — | — | Available |
| K4UMG | 8 | 55 | 2031-03-25 | — | Active (Vanity) |
| K4UMH | 9 | 53 | 2031-11-10 | — | Active (Vanity) |
| K4UMI | 10 | 49 | 2035-03-15 | — | Active |
| K4UMJ | 10 | 59 | — | — | Available |
| K4UMK | 9 | 55 | 2034-08-09 | — | Active (Vanity) |
| K4UML | 9 | 55 | — | — | Available |
| K4UMM | 8 | 53 | 2020-05-16 | 2022-05-17 | Available |
| K4UMN | 10 | 51 | — | — | Available |
| K4UMO | 9 | 57 | 2003-11-09 | 2005-11-10 | Available |
| K4UMP | 9 | 57 | — | — | Available |
| K4UMQ | 9 | 59 | — | — | Available |
| K4UMR | 10 | 53 | 2025-08-15 | — | Active (Vanity) |
| K4UMS | 10 | 51 | — | — | Available |
| K4UMT | 9 | 49 | 2010-09-28 | 2012-09-29 | Available |
| K4UMU | 10 | 53 | — | — | Available |
| K4UMV | 9 | 55 | 2028-10-30 | — | Active (Vanity) |
| K4UMW | 9 | 55 | 2025-08-30 | — | Active |
| K4UMX | 9 | 57 | — | — | Available |
| K4UMY | 9 | 59 | — | — | Available |
| K4UMZ | 9 | 57 | — | — | Available |
| K4UNA | 11 | 49 | 2027-07-25 | — | Active |
| K4UNB | 11 | 53 | — | — | Available |
| K4UNC | 11 | 55 | 2036-11-08 | — | Active (Vanity) |
| K4UND | 11 | 51 | — | — | Available |
| K4UNE | 11 | 45 | 2004-10-31 | 2006-11-01 | Available |
| K4UNF | 11 | 53 | 2018-03-10 | 2020-03-11 | Available |
| K4UNG | 10 | 53 | — | — | Available |
| K4UNH | 11 | 51 | — | — | Available |
| K4UNI | 12 | 47 | 2031-03-30 | — | Active (Vanity) |
| K4UNJ | 12 | 57 | 1999-08-29 | 2001-08-30 | Available |
| K4UNK | 11 | 53 | 2032-08-02 | — | Active (Vanity) |
| K4UNL | 11 | 53 | — | — | Available |
| K4UNM | 10 | 51 | 2019-03-11 | 2021-03-12 | Available |
| K4UNN | 12 | 49 | — | — | Available |
| K4UNO | 11 | 55 | 2025-04-08 | — | Active (Vanity) |
| K4UNP | 11 | 55 | — | — | Available |
| K4UNQ | 11 | 57 | — | — | Available |
| K4UNR | 12 | 51 | — | — | Available |
| K4UNS | 12 | 49 | — | — | Available |
| K4UNT | 11 | 47 | 2000-05-25 | 2002-05-26 | Available |
| K4UNU | 12 | 51 | — | — | Available |
| K4UNV | 11 | 53 | — | — | Available |
| K4UNW | 11 | 53 | 2021-05-12 | 2023-05-13 | Available |
| K4UNX | 11 | 55 | 2028-04-22 | — | Active (Vanity) |
| K4UNY | 11 | 57 | 2013-02-23 | 2015-02-24 | Available |
| K4UNZ | 11 | 55 | 2033-06-10 | — | Active (Vanity) |
| K4UOA | 10 | 55 | 2034-07-31 | — | Active (Vanity) |
| K4UOB | 10 | 59 | — | — | Available |
| K4UOC | 10 | 61 | — | — | Available |
| K4UOD | 10 | 57 | — | — | Available |
| K4UOE | 10 | 51 | 2033-11-30 | — | Active |
| K4UOF | 10 | 59 | — | — | Available |
| K4UOG | 9 | 59 | 2006-05-17 | 2008-05-18 | Available |
| K4UOH | 10 | 57 | — | — | Available |
| K4UOI | 11 | 53 | — | — | Available |
| K4UOJ | 11 | 63 | 2024-04-06 | 2026-04-07 | Available |
| K4UOK | 10 | 59 | 2029-04-24 | — | Active (Vanity) |
| K4UOL | 10 | 59 | 2029-02-23 | — | Active (Vanity) |
| K4UOM | 9 | 57 | 2015-02-18 | 2017-02-19 | Available |
| K4UON | 11 | 55 | 2018-08-26 | 2020-08-27 | Available |
| K4UOO | 10 | 61 | 2036-10-22 | — | Active |
| K4UOP | 10 | 61 | — | — | Available |
| K4UOQ | 10 | 63 | — | — | Available |
| K4UOR | 11 | 57 | 2030-05-22 | — | Active |
| K4UOS | 11 | 55 | 2036-07-01 | — | Active (Vanity) |
| K4UOT | 10 | 53 | 2024-06-02 | 2026-06-03 | Available |
| K4UOU | 11 | 57 | — | — | Available |