District 4
2x2 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| KO4MQ | 8 | 63 | 1997-10-15 | 1999-10-16 | Available |
| KO4MR | 9 | 57 | 2010-12-21 | 2012-12-22 | Available |
| KO4MS | 9 | 55 | — | — | Available |
| KO4MT | 8 | 53 | 2021-11-19 | 2023-11-20 | Available |
| KO4MU | 9 | 57 | 2021-11-19 | 2023-11-20 | Available |
| KO4MV | 8 | 59 | 2011-11-19 | 2013-11-20 | Available |
| KO4MW | 8 | 59 | 2031-11-19 | — | Active |
| KO4MX | 8 | 61 | 2032-11-24 | — | Active |
| KO4MY | 8 | 63 | — | — | Available |
| KO4MZ | 8 | 61 | 2031-11-19 | — | Active |
| KO4NA | 10 | 53 | 2031-11-26 | — | Active |
| KO4NB | 10 | 57 | 2031-11-29 | — | Active |
| KO4NC | 10 | 59 | — | — | Available |
| KO4ND | 10 | 55 | 2032-12-24 | — | Active |
| KO4NE | 10 | 49 | 2028-04-17 | — | Active (Vanity) |
| KO4NF | 10 | 57 | 2031-11-26 | — | Active |
| KO4NG | 9 | 57 | 2022-08-09 | 2024-08-10 | Available |
| KO4NH | 10 | 55 | — | — | Available |
| KO4NI | 11 | 51 | — | — | Available |
| KO4NJ | 11 | 61 | 2032-04-13 | — | Active |
| KO4NK | 10 | 57 | 2012-03-26 | 2014-03-27 | Available |
| KO4NL | 10 | 57 | 2012-02-04 | 2014-02-05 | Available |
| KO4NM | 9 | 55 | 2032-01-05 | — | Active |
| KO4NN | 11 | 53 | 2022-08-04 | 2024-08-05 | Available |
| KO4NO | 10 | 59 | 2032-02-08 | — | Active |
| KO4NP | 10 | 59 | 2011-12-03 | 2013-12-04 | Available |
| KO4NQ | 10 | 61 | 2023-05-18 | 2025-05-19 | Available |
| KO4NR | 11 | 55 | 2031-12-03 | — | Active |
| KO4NS | 11 | 53 | — | — | Available |
| KO4NT | 10 | 51 | — | — | Available |
| KO4NU | 11 | 55 | 1997-10-01 | 1999-10-02 | Available |
| KO4NV | 10 | 57 | — | — | Available |
| KO4NW | 10 | 57 | 2004-06-05 | 2006-06-06 | Available |
| KO4NX | 10 | 59 | 2004-10-09 | 2006-10-10 | Available |
| KO4NY | 10 | 61 | — | — | Available |
| KO4NZ | 10 | 59 | — | — | Available |
| KO4OA | 9 | 59 | — | — | Available |
| KO4OB | 9 | 63 | 2032-10-06 | — | Active |
| KO4OC | 9 | 65 | 2032-07-14 | — | Active |
| KO4OD | 9 | 61 | 2031-12-10 | — | Active |
| KO4OE | 9 | 55 | 2001-02-24 | 2003-02-25 | Available |
| KO4OF | 9 | 63 | 2031-12-10 | — | Active |
| KO4OG | 8 | 63 | 1997-09-17 | 1999-09-18 | Available |
| KO4OH | 9 | 61 | 2032-01-26 | — | Active |
| KO4OI | 10 | 57 | — | — | Available |
| KO4OJ | 10 | 67 | 2001-12-17 | 2003-12-18 | Available |
| KO4OK | 9 | 63 | 2031-12-24 | — | Active |
| KO4OL | 9 | 63 | 2033-12-21 | — | Active |
| KO4OM | 8 | 61 | 2031-12-24 | — | Active |
| KO4ON | 10 | 59 | — | — | Available |
| KO4OO | 9 | 65 | 2032-03-05 | — | Active |
| KO4OP | 9 | 65 | 2031-12-31 | — | Active |
| KO4OQ | 9 | 67 | — | — | Available |
| KO4OR | 10 | 61 | 2016-08-26 | 2018-08-27 | Available |
| KO4OS | 10 | 59 | — | — | Available |
| KO4OT | 9 | 57 | 2031-12-31 | — | Active |
| KO4OU | 10 | 61 | 2033-03-30 | — | Active |
| KO4OV | 9 | 63 | 2021-12-31 | 2024-01-01 | Available |
| KO4OW | 9 | 63 | — | — | Available |
| KO4OX | 9 | 65 | 2001-06-16 | 2003-06-17 | Available |
| KO4OY | 9 | 67 | 2012-01-07 | 2014-01-08 | Available |
| KO4OZ | 9 | 65 | 2023-04-15 | 2025-04-16 | Available |
| KO4PA | 9 | 59 | 2032-05-17 | — | Active (Vanity) |
| KO4PB | 9 | 63 | 2033-01-11 | — | Active |
| KO4PC | 9 | 65 | 2032-07-08 | — | Active |
| KO4PD | 9 | 61 | 2022-01-07 | 2024-01-08 | Available |
| KO4PE | 9 | 55 | — | — | Available |
| KO4PF | 9 | 63 | 2032-04-06 | — | Active |
| KO4PG | 8 | 63 | — | — | Available |
| KO4PH | 9 | 61 | 2032-02-20 | — | Active |
| KO4PI | 10 | 57 | 2032-01-19 | — | Active |
| KO4PJ | 10 | 67 | 2006-01-10 | 2008-01-11 | Available |
| KO4PK | 9 | 63 | 2032-01-07 | — | Active |
| KO4PL | 9 | 63 | 2022-01-07 | 2024-01-08 | Available |
| KO4PM | 8 | 61 | 2033-12-28 | — | Active |
| KO4PN | 10 | 59 | 2002-01-07 | 2004-01-08 | Available |
| KO4PO | 9 | 65 | 2022-01-14 | 2024-01-15 | Available |
| KO4PP | 9 | 65 | 2032-01-20 | — | Active |
| KO4PQ | 9 | 67 | 2002-01-14 | 2004-01-15 | Available |
| KO4PR | 10 | 61 | 2028-09-09 | — | Active (Vanity) |
| KO4PS | 10 | 59 | — | — | Available |
| KO4PT | 9 | 57 | 2022-01-14 | 2024-01-15 | Available |
| KO4PU | 10 | 61 | 2022-01-21 | 2024-01-22 | Available |
| KO4PV | 9 | 63 | 2035-01-14 | — | Active (Vanity) |
| KO4PW | 9 | 63 | — | — | Available |
| KO4PX | 9 | 65 | — | — | Available |
| KO4PY | 9 | 67 | 2032-07-14 | — | Active |
| KO4PZ | 9 | 65 | 2026-08-04 | 2028-08-05 | Canceled (grace period) |
| KO4QA | 9 | 61 | 2012-01-21 | 2014-01-22 | Available |
| KO4QB | 9 | 65 | 2009-10-10 | 2011-10-11 | Available |
| KO4QC | 9 | 67 | 2032-01-21 | — | Active |
| KO4QD | 9 | 63 | 2014-01-04 | 2016-01-05 | Available |
| KO4QE | 9 | 57 | — | — | Available |
| KO4QF | 9 | 65 | 2013-05-04 | 2015-05-05 | Available |
| KO4QG | 8 | 65 | 2033-11-02 | — | Active |
| KO4QH | 9 | 63 | 2002-01-21 | 2004-01-22 | Available |
| KO4QI | 10 | 59 | — | — | Available |
| KO4QJ | 10 | 69 | 2023-02-26 | 2025-02-27 | Available |
| KO4QK | 9 | 65 | 2012-08-09 | 2014-08-10 | Available |
| KO4QL | 9 | 65 | — | — | Available |