District 4
1x3 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| K4OQU | 10 | 63 | — | — | Available |
| K4OQV | 9 | 65 | — | — | Available |
| K4OQW | 9 | 65 | 2009-10-20 | 2011-10-21 | Available |
| K4OQX | 9 | 67 | — | — | Available |
| K4OQY | 9 | 69 | — | — | Available |
| K4OQZ | 9 | 67 | — | — | Available |
| K4ORA | 10 | 55 | 2031-04-20 | — | Active (Vanity) |
| K4ORB | 10 | 59 | 2023-02-19 | 2025-02-20 | Available |
| K4ORC | 10 | 61 | 2031-01-15 | — | Active (Vanity) |
| K4ORD | 10 | 57 | 2028-09-08 | — | Active |
| K4ORE | 10 | 51 | 2032-04-30 | — | Active (Vanity) |
| K4ORF | 10 | 59 | — | — | Available |
| K4ORG | 9 | 59 | 2034-03-15 | — | Active (Vanity) |
| K4ORH | 10 | 57 | 2026-02-21 | — | Active |
| K4ORI | 11 | 53 | — | — | Available |
| K4ORJ | 11 | 63 | — | — | Available |
| K4ORK | 10 | 59 | — | — | Available |
| K4ORL | 10 | 59 | 2031-06-04 | — | Active (Vanity) |
| K4ORM | 9 | 57 | — | — | Available |
| K4ORN | 11 | 55 | 2012-11-26 | 2014-11-27 | Available |
| K4ORO | 10 | 61 | — | — | Available |
| K4ORP | 10 | 61 | — | — | Available |
| K4ORQ | 10 | 63 | — | — | Available |
| K4ORR | 11 | 57 | 2027-07-11 | — | Active (Vanity) |
| K4ORS | 11 | 55 | 2015-02-28 | 2017-03-01 | Available |
| K4ORT | 10 | 53 | 2030-07-14 | — | Active (Vanity) |
| K4ORU | 11 | 57 | 2024-07-24 | 2026-07-25 | Available |
| K4ORV | 10 | 59 | 2032-02-24 | — | Active (Vanity) |
| K4ORW | 10 | 59 | — | — | Available |
| K4ORX | 10 | 61 | 2012-02-18 | 2014-02-19 | Available |
| K4ORY | 10 | 63 | 2025-08-12 | — | Active (Vanity) |
| K4ORZ | 10 | 61 | 2033-09-21 | — | Active (Vanity) |
| K4OSA | 10 | 53 | 2028-01-09 | — | Active (Vanity) |
| K4OSB | 10 | 57 | 2031-03-19 | — | Active (Vanity) |
| K4OSC | 10 | 59 | 2013-03-08 | 2015-03-09 | Available |
| K4OSD | 10 | 55 | — | — | Available |
| K4OSE | 10 | 49 | 2035-08-15 | — | Active |
| K4OSF | 10 | 57 | — | — | Available |
| K4OSG | 9 | 57 | 2030-04-17 | — | Active (Vanity) |
| K4OSH | 10 | 55 | 2034-08-31 | — | Active (Vanity) |
| K4OSI | 11 | 51 | 2024-03-05 | 2026-03-06 | Available |
| K4OSJ | 11 | 61 | 2027-12-29 | — | Active (Vanity) |
| K4OSK | 10 | 57 | 2034-03-16 | — | Active (Vanity) |
| K4OSL | 10 | 57 | 2028-08-07 | — | Active (Vanity) |
| K4OSM | 9 | 55 | 2026-04-01 | — | Active |
| K4OSN | 11 | 53 | — | — | Available |
| K4OSO | 10 | 59 | 2033-07-14 | — | Active (Vanity) |
| K4OSP | 10 | 59 | — | — | Available |
| K4OSQ | 10 | 61 | 2007-11-13 | 2009-11-14 | Available |
| K4OSR | 11 | 55 | 2030-01-03 | — | Active (Vanity) |
| K4OSS | 11 | 53 | 2035-01-24 | — | Active (Vanity) |
| K4OST | 10 | 51 | 2031-09-27 | — | Active (Vanity) |
| K4OSU | 11 | 55 | 2036-07-11 | — | Active (Vanity) |
| K4OSV | 10 | 57 | — | — | Available |
| K4OSW | 10 | 57 | — | — | Available |
| K4OSX | 10 | 59 | 2031-03-13 | — | Active (Vanity) |
| K4OSY | 10 | 61 | — | — | Available |
| K4OSZ | 10 | 59 | — | — | Available |
| K4OTA | 9 | 51 | 2035-01-22 | — | Active (Vanity) |
| K4OTB | 9 | 55 | — | — | Available |
| K4OTC | 9 | 57 | 2035-04-01 | — | Active (Vanity) |
| K4OTD | 9 | 53 | — | — | Available |
| K4OTE | 9 | 47 | — | — | Available |
| K4OTF | 9 | 55 | 2031-03-23 | — | Active (Vanity) |
| K4OTG | 8 | 55 | — | — | Available |
| K4OTH | 9 | 53 | 2033-07-12 | — | Active (Vanity) |
| K4OTI | 10 | 49 | — | — | Available |
| K4OTJ | 10 | 59 | 2036-04-19 | — | Active (Vanity) |
| K4OTK | 9 | 55 | — | — | Available |
| K4OTL | 9 | 55 | 2033-11-07 | — | Active (Vanity) |
| K4OTM | 8 | 53 | 2028-01-30 | — | Active |
| K4OTN | 10 | 51 | — | — | Available |
| K4OTO | 9 | 57 | 2028-04-06 | — | Active (Vanity) |
| K4OTP | 9 | 57 | — | — | Available |
| K4OTQ | 9 | 59 | — | — | Available |
| K4OTR | 10 | 53 | 2025-11-28 | — | Active |
| K4OTS | 10 | 51 | 2016-08-30 | 2018-08-31 | Available |
| K4OTT | 9 | 49 | 2034-01-13 | — | Active (Vanity) |
| K4OTU | 10 | 53 | 2022-09-15 | 2024-09-16 | Available |
| K4OTV | 9 | 55 | 2026-10-10 | — | Active (Vanity) |
| K4OTW | 9 | 55 | 2013-07-26 | 2015-07-27 | Available |
| K4OTX | 9 | 57 | 2030-08-18 | — | Active (Vanity) |
| K4OTY | 9 | 59 | 2021-01-06 | 2023-01-07 | Available |
| K4OTZ | 9 | 57 | 2029-12-10 | — | Active (Vanity) |
| K4OUA | 10 | 55 | 2009-10-10 | 2011-10-11 | Available |
| K4OUB | 10 | 59 | 2004-12-13 | 2006-12-14 | Available |
| K4OUC | 10 | 61 | 2025-09-16 | — | Active |
| K4OUD | 10 | 57 | — | — | Available |
| K4OUE | 10 | 51 | 2027-04-17 | — | Active |
| K4OUF | 10 | 59 | — | — | Available |
| K4OUG | 9 | 59 | — | — | Available |
| K4OUH | 10 | 57 | — | — | Available |
| K4OUI | 11 | 53 | — | — | Available |
| K4OUJ | 11 | 63 | 2028-06-23 | — | Active |
| K4OUK | 10 | 59 | — | — | Available |
| K4OUL | 10 | 59 | — | — | Available |
| K4OUM | 9 | 57 | — | — | Available |
| K4OUN | 11 | 55 | — | — | Available |
| K4OUO | 10 | 61 | — | — | Available |
| K4OUP | 10 | 61 | — | — | Available |