District 4
2x2 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| KO4BC | 9 | 63 | 2001-05-07 | 2003-05-08 | Available |
| KO4BD | 9 | 59 | 2022-12-12 | 2024-12-13 | Available |
| KO4BE | 9 | 53 | 2011-05-07 | 2013-05-08 | Available |
| KO4BF | 9 | 61 | 2021-05-07 | 2023-05-08 | Available |
| KO4BG | 8 | 61 | 2031-05-07 | — | Active |
| KO4BH | 9 | 59 | 2034-04-01 | — | Active (Vanity) |
| KO4BI | 10 | 55 | 2003-01-07 | 2005-01-08 | Available |
| KO4BJ | 10 | 65 | — | — | Available |
| KO4BK | 9 | 61 | — | — | Available |
| KO4BL | 9 | 61 | 2035-04-26 | — | Active (Vanity) |
| KO4BM | 8 | 59 | — | — | Available |
| KO4BN | 10 | 57 | 2001-05-07 | 2003-05-08 | Available |
| KO4BO | 9 | 63 | 2031-11-02 | — | Active |
| KO4BP | 9 | 63 | 2012-03-20 | 2014-03-21 | Available |
| KO4BQ | 9 | 65 | — | — | Available |
| KO4BR | 10 | 59 | 2036-10-20 | — | Active (Vanity) |
| KO4BS | 10 | 57 | 2031-06-12 | — | Active |
| KO4BT | 9 | 55 | 2000-06-23 | 2002-06-24 | Available |
| KO4BU | 10 | 59 | 2031-05-14 | — | Active |
| KO4BV | 9 | 61 | 2031-05-14 | — | Active |
| KO4BW | 9 | 61 | — | — | Available |
| KO4BX | 9 | 63 | 2001-05-14 | 2003-05-15 | Available |
| KO4BY | 9 | 65 | 2011-05-14 | 2013-05-15 | Available |
| KO4BZ | 9 | 63 | — | — | Available |
| KO4CA | 9 | 59 | — | — | Available |
| KO4CB | 9 | 63 | 2031-05-14 | — | Active |
| KO4CC | 9 | 65 | 2031-05-21 | — | Active (Vanity) |
| KO4CD | 9 | 61 | 2034-04-06 | — | Active (Vanity) |
| KO4CE | 9 | 55 | 2011-05-21 | 2013-05-22 | Available |
| KO4CF | 9 | 63 | 2011-05-21 | 2013-05-22 | Available |
| KO4CG | 8 | 63 | 2007-03-03 | 2009-03-04 | Available |
| KO4CH | 9 | 61 | 2021-12-03 | 2023-12-04 | Available |
| KO4CI | 10 | 57 | 2031-05-28 | — | Active |
| KO4CJ | 10 | 67 | 2031-05-28 | — | Active |
| KO4CK | 9 | 63 | 2031-10-22 | — | Active |
| KO4CL | 9 | 63 | — | — | Available |
| KO4CM | 8 | 61 | 2031-06-04 | — | Active |
| KO4CN | 10 | 59 | 2032-03-13 | — | Active |
| KO4CO | 9 | 65 | 2002-05-03 | 2004-05-04 | Available |
| KO4CP | 9 | 65 | 2021-06-04 | 2023-06-05 | Available |
| KO4CQ | 9 | 67 | 2036-02-26 | — | Active (Vanity) |
| KO4CR | 10 | 61 | 2031-06-04 | — | Active |
| KO4CS | 10 | 59 | — | — | Available |
| KO4CT | 9 | 57 | 2021-06-11 | 2023-06-12 | Available |
| KO4CU | 10 | 61 | 2001-08-20 | 2003-08-21 | Available |
| KO4CV | 9 | 63 | — | — | Available |
| KO4CW | 9 | 63 | 2036-07-21 | — | Active (Vanity) |
| KO4CX | 9 | 65 | 2034-03-22 | — | Active |
| KO4CY | 9 | 67 | 2021-06-11 | 2023-06-12 | Available |
| KO4CZ | 9 | 65 | 2021-08-05 | 2023-08-06 | Available |
| KO4DA | 9 | 55 | 2021-06-11 | 2023-06-12 | Available |
| KO4DB | 9 | 59 | 2035-08-16 | — | Active (Vanity) |
| KO4DC | 9 | 61 | 2031-06-11 | — | Active |
| KO4DD | 9 | 57 | — | — | Available |
| KO4DE | 9 | 51 | 2001-06-18 | 2003-06-19 | Available |
| KO4DF | 9 | 59 | 2034-12-27 | — | Active |
| KO4DG | 8 | 59 | 2029-11-13 | — | Active |
| KO4DH | 9 | 57 | 2003-09-30 | 2005-10-01 | Available |
| KO4DI | 10 | 53 | 2032-01-21 | — | Active |
| KO4DJ | 10 | 63 | — | — | Available |
| KO4DK | 9 | 59 | 2022-10-16 | 2024-10-17 | Available |
| KO4DL | 9 | 59 | — | — | Available |
| KO4DM | 8 | 57 | — | — | Available |
| KO4DN | 10 | 55 | 2033-09-21 | — | Active |
| KO4DO | 9 | 61 | 2031-01-05 | — | Active (Vanity) |
| KO4DP | 9 | 61 | 2001-06-25 | 2003-06-26 | Available |
| KO4DQ | 9 | 63 | 2021-06-25 | 2023-06-26 | Available |
| KO4DR | 10 | 57 | 2026-04-10 | 2028-04-11 | Canceled (grace period) |
| KO4DS | 10 | 55 | 2032-05-20 | — | Active |
| KO4DT | 9 | 53 | 2031-10-29 | — | Active |
| KO4DU | 10 | 57 | 2009-12-25 | 2011-12-26 | Available |
| KO4DV | 9 | 59 | — | — | Available |
| KO4DW | 9 | 59 | 2021-12-03 | 2023-12-04 | Available |
| KO4DX | 9 | 61 | 2028-07-07 | — | Active |
| KO4DY | 9 | 63 | 2011-07-02 | 2013-07-03 | Available |
| KO4DZ | 9 | 61 | 2011-07-02 | 2013-07-03 | Available |
| KO4EA | 9 | 49 | 2024-03-05 | 2026-03-06 | Available |
| KO4EB | 9 | 53 | 2000-09-12 | 2002-09-13 | Available |
| KO4EC | 9 | 55 | — | — | Available |
| KO4ED | 9 | 51 | 2011-07-02 | 2013-07-03 | Available |
| KO4EE | 9 | 45 | — | — | Available |
| KO4EF | 9 | 53 | 2031-07-09 | — | Active |
| KO4EG | 8 | 53 | 2011-07-02 | 2013-07-03 | Available |
| KO4EH | 9 | 51 | — | — | Available |
| KO4EI | 10 | 47 | — | — | Available |
| KO4EJ | 10 | 57 | — | — | Available |
| KO4EK | 9 | 53 | 2011-07-02 | 2013-07-03 | Available |
| KO4EL | 9 | 53 | 2001-07-09 | 2003-07-10 | Available |
| KO4EM | 8 | 51 | 2011-07-09 | 2013-07-10 | Available |
| KO4EN | 10 | 49 | 2000-06-13 | 2002-06-14 | Available |
| KO4EO | 9 | 55 | — | — | Available |
| KO4EP | 9 | 55 | 2021-08-20 | 2023-08-21 | Available |
| KO4EQ | 9 | 57 | — | — | Available |
| KO4ER | 10 | 51 | 2031-07-20 | — | Active |
| KO4ES | 10 | 49 | 2021-09-10 | 2023-09-11 | Available |
| KO4ET | 9 | 47 | 2031-04-17 | — | Active (Vanity) |
| KO4EU | 10 | 51 | — | — | Available |
| KO4EV | 9 | 53 | — | — | Available |
| KO4EW | 9 | 53 | — | — | Available |
| KO4EX | 9 | 55 | 2011-07-16 | 2013-07-17 | Available |