District 4
1x3 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| K4TZL | 9 | 55 | — | — | Available |
| K4TZM | 8 | 53 | — | — | Available |
| K4TZN | 10 | 51 | 1998-08-30 | 2000-08-31 | Available |
| K4TZO | 9 | 57 | 2030-02-28 | — | Active (Vanity) |
| K4TZP | 9 | 57 | — | — | Available |
| K4TZQ | 9 | 59 | — | — | Available |
| K4TZR | 10 | 53 | 2023-02-20 | 2025-02-21 | Available |
| K4TZS | 10 | 51 | — | — | Available |
| K4TZT | 9 | 49 | 2030-10-16 | — | Active (Vanity) |
| K4TZU | 10 | 53 | — | — | Available |
| K4TZV | 9 | 55 | — | — | Available |
| K4TZW | 9 | 55 | — | — | Available |
| K4TZX | 9 | 57 | — | — | Available |
| K4TZY | 9 | 59 | 2031-04-10 | — | Active (Vanity) |
| K4TZZ | 9 | 57 | 2034-03-31 | — | Active (Vanity) |
| K4UAA | 10 | 49 | — | — | Available |
| K4UAB | 10 | 53 | 2036-05-12 | — | Active (Vanity) |
| K4UAC | 10 | 55 | — | — | Available |
| K4UAD | 10 | 51 | 2010-02-02 | 2012-02-03 | Available |
| K4UAE | 10 | 45 | 2033-06-27 | — | Active (Vanity) |
| K4UAF | 10 | 53 | 2034-05-24 | — | Active |
| K4UAG | 9 | 53 | 2020-08-07 | 2022-08-08 | Available |
| K4UAH | 10 | 51 | 2032-05-11 | — | Active (Vanity) |
| K4UAI | 11 | 47 | 2026-04-15 | — | Active (Vanity) |
| K4UAJ | 11 | 57 | — | — | Available |
| K4UAK | 10 | 53 | 2005-07-18 | 2007-07-19 | Available |
| K4UAL | 10 | 53 | 2027-05-05 | — | Active (Vanity) |
| K4UAM | 9 | 51 | — | — | Available |
| K4UAN | 11 | 49 | 2028-07-15 | — | Active (Vanity) |
| K4UAO | 10 | 55 | — | — | Available |
| K4UAP | 10 | 55 | 2025-02-11 | 2027-02-12 | Canceled (grace period) |
| K4UAQ | 10 | 57 | — | — | Available |
| K4UAR | 11 | 51 | 2033-01-31 | — | Active (Vanity) |
| K4UAS | 11 | 49 | 2019-03-25 | 2021-03-26 | Available |
| K4UAT | 10 | 47 | 2034-07-09 | — | Active (Vanity) |
| K4UAU | 11 | 51 | — | — | Available |
| K4UAV | 10 | 53 | 2030-08-31 | — | Active (Vanity) |
| K4UAW | 10 | 53 | 2029-09-01 | — | Active (Vanity) |
| K4UAX | 10 | 55 | — | — | Available |
| K4UAY | 10 | 57 | 2019-12-25 | 2021-12-26 | Available |
| K4UAZ | 10 | 55 | — | — | Available |
| K4UBA | 10 | 53 | — | — | Available |
| K4UBB | 10 | 57 | 2033-04-04 | — | Active (Vanity) |
| K4UBC | 10 | 59 | — | — | Available |
| K4UBD | 10 | 55 | 2032-10-14 | — | Active (Vanity) |
| K4UBE | 10 | 49 | 2019-10-23 | 2021-10-24 | Available |
| K4UBF | 10 | 57 | 2006-04-22 | 2008-04-23 | Available |
| K4UBG | 9 | 57 | — | — | Available |
| K4UBH | 10 | 55 | — | — | Available |
| K4UBI | 11 | 51 | — | — | Available |
| K4UBJ | 11 | 61 | — | — | Available |
| K4UBK | 10 | 57 | — | — | Available |
| K4UBL | 10 | 57 | 2003-03-11 | 2005-03-12 | Available |
| K4UBM | 9 | 55 | 2018-12-17 | 2020-12-18 | Available |
| K4UBN | 11 | 53 | — | — | Available |
| K4UBO | 10 | 59 | — | — | Available |
| K4UBP | 10 | 59 | — | — | Available |
| K4UBQ | 10 | 61 | — | — | Available |
| K4UBR | 11 | 55 | 2028-04-29 | — | Active (Vanity) |
| K4UBS | 11 | 53 | 2028-05-13 | — | Active (Vanity) |
| K4UBT | 10 | 51 | 2033-07-22 | — | Active (Vanity) |
| K4UBU | 11 | 55 | 2030-10-16 | — | Active (Vanity) |
| K4UBV | 10 | 57 | 2028-04-27 | — | Active |
| K4UBW | 10 | 57 | — | — | Available |
| K4UBX | 10 | 59 | 2008-01-06 | 2010-01-07 | Available |
| K4UBY | 10 | 61 | — | — | Available |
| K4UBZ | 10 | 59 | 2006-07-29 | 2008-07-30 | Available |
| K4UCA | 10 | 55 | — | — | Available |
| K4UCB | 10 | 59 | — | — | Available |
| K4UCC | 10 | 61 | — | — | Available |
| K4UCD | 10 | 57 | — | — | Available |
| K4UCE | 10 | 51 | — | — | Available |
| K4UCF | 10 | 59 | 2027-10-16 | — | Active (Vanity) |
| K4UCG | 9 | 59 | — | — | Available |
| K4UCH | 10 | 57 | — | — | Available |
| K4UCI | 11 | 53 | 2027-04-17 | — | Active (Vanity) |
| K4UCJ | 11 | 63 | — | — | Available |
| K4UCK | 10 | 59 | — | — | Available |
| K4UCL | 10 | 59 | — | — | Available |
| K4UCM | 9 | 57 | — | — | Available |
| K4UCN | 11 | 55 | 1998-08-02 | 2000-08-03 | Available |
| K4UCO | 10 | 61 | 2014-07-15 | 2016-07-16 | Available |
| K4UCP | 10 | 61 | 2004-07-13 | 2006-07-14 | Available |
| K4UCQ | 10 | 63 | 2025-09-25 | — | Active |
| K4UCR | 11 | 57 | — | — | Available |
| K4UCS | 11 | 55 | — | — | Available |
| K4UCT | 10 | 53 | — | — | Available |
| K4UCU | 11 | 57 | — | — | Available |
| K4UCV | 10 | 59 | — | — | Available |
| K4UCW | 10 | 59 | — | — | Available |
| K4UCX | 10 | 61 | — | — | Available |
| K4UCY | 10 | 63 | 2017-11-04 | 2019-11-05 | Available |
| K4UCZ | 10 | 61 | — | — | Available |
| K4UDA | 10 | 51 | 2031-08-06 | — | Active |
| K4UDB | 10 | 55 | — | — | Available |
| K4UDC | 10 | 57 | — | — | Available |
| K4UDD | 10 | 53 | — | — | Available |
| K4UDE | 10 | 47 | — | — | Available |
| K4UDF | 10 | 55 | — | — | Available |
| K4UDG | 9 | 55 | — | — | Available |