District 4
2x2 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| KO4QM | 8 | 63 | 2000-06-06 | 2002-06-07 | Available |
| KO4QN | 10 | 61 | 2032-01-21 | — | Active |
| KO4QO | 9 | 67 | 2012-01-28 | 2014-01-29 | Available |
| KO4QP | 9 | 67 | 1999-05-12 | 2001-05-13 | Available |
| KO4QQ | 9 | 69 | — | — | Available |
| KO4QR | 10 | 63 | 2022-01-28 | 2024-01-29 | Available |
| KO4QS | 10 | 61 | 2032-02-04 | — | Active |
| KO4QT | 9 | 59 | 2013-03-09 | 2015-03-10 | Available |
| KO4QU | 10 | 63 | 2034-03-25 | — | Active |
| KO4QV | 9 | 65 | 2022-02-04 | 2024-02-05 | Available |
| KO4QW | 9 | 65 | 2000-10-28 | 2002-10-29 | Available |
| KO4QX | 9 | 67 | 2021-11-18 | 2023-11-19 | Available |
| KO4QY | 9 | 69 | 2002-05-19 | 2004-05-20 | Available |
| KO4QZ | 9 | 67 | — | — | Available |
| KO4RA | 10 | 55 | 2032-02-04 | — | Active |
| KO4RB | 10 | 59 | 2027-10-06 | — | Active (Vanity) |
| KO4RC | 10 | 61 | — | — | Available |
| KO4RD | 10 | 57 | 2032-09-15 | — | Active |
| KO4RE | 10 | 51 | — | — | Available |
| KO4RF | 10 | 59 | — | — | Available |
| KO4RG | 9 | 59 | 2003-03-11 | 2005-03-12 | Available |
| KO4RH | 10 | 57 | 2022-02-04 | 2024-02-05 | Available |
| KO4RI | 11 | 53 | — | — | Available |
| KO4RJ | 11 | 63 | 2012-02-11 | 2014-02-12 | Available |
| KO4RK | 10 | 59 | 2032-02-11 | — | Active |
| KO4RL | 10 | 59 | 1997-10-20 | 1999-10-21 | Available |
| KO4RM | 9 | 57 | 2032-01-19 | — | Active (Vanity) |
| KO4RN | 11 | 55 | 2032-09-08 | — | Active |
| KO4RO | 10 | 61 | 2032-08-04 | — | Active |
| KO4RP | 10 | 61 | — | — | Available |
| KO4RQ | 10 | 63 | — | — | Available |
| KO4RR | 11 | 57 | 2027-12-23 | — | Active (Vanity) |
| KO4RS | 11 | 55 | 2032-02-11 | — | Active |
| KO4RT | 10 | 53 | 2033-07-15 | — | Active (Vanity) |
| KO4RU | 11 | 57 | 1998-05-07 | 2000-05-08 | Available |
| KO4RV | 10 | 59 | 2012-06-30 | 2014-07-01 | Available |
| KO4RW | 10 | 59 | 2033-02-28 | — | Active (Vanity) |
| KO4RX | 10 | 61 | 2032-12-23 | — | Active (Vanity) |
| KO4RY | 10 | 63 | 2000-06-02 | 2002-06-03 | Available |
| KO4RZ | 10 | 61 | 2002-02-11 | 2004-02-12 | Available |
| KO4SA | 10 | 53 | 2031-09-18 | — | Active (Vanity) |
| KO4SB | 10 | 57 | 2033-04-27 | — | Active |
| KO4SC | 10 | 59 | 2022-02-11 | 2024-02-12 | Available |
| KO4SD | 10 | 55 | 2032-02-11 | — | Active |
| KO4SE | 10 | 49 | 2033-07-06 | — | Active |
| KO4SF | 10 | 57 | — | — | Available |
| KO4SG | 9 | 57 | 2012-02-18 | 2014-02-19 | Available |
| KO4SH | 10 | 55 | 2012-02-18 | 2014-02-19 | Available |
| KO4SI | 11 | 51 | 2022-10-18 | 2024-10-19 | Available |
| KO4SJ | 11 | 61 | 2032-02-18 | — | Active |
| KO4SK | 10 | 57 | 2002-02-18 | 2004-02-19 | Available |
| KO4SL | 10 | 57 | — | — | Available |
| KO4SM | 9 | 55 | 2031-10-15 | — | Active (Vanity) |
| KO4SN | 11 | 53 | 2022-02-25 | 2024-02-26 | Available |
| KO4SO | 10 | 59 | — | — | Available |
| KO4SP | 10 | 59 | 2003-10-05 | 2005-10-06 | Available |
| KO4SQ | 10 | 61 | 2002-02-25 | 2004-02-26 | Available |
| KO4SR | 11 | 55 | 2010-02-09 | 2012-02-10 | Available |
| KO4SS | 11 | 53 | 2033-01-19 | — | Active |
| KO4ST | 10 | 51 | 2021-09-18 | 2023-09-19 | Available |
| KO4SU | 11 | 55 | 2012-09-22 | 2014-09-23 | Available |
| KO4SV | 10 | 57 | — | — | Available |
| KO4SW | 10 | 57 | 2022-03-03 | 2024-03-04 | Available |
| KO4SX | 10 | 59 | 2012-03-03 | 2014-03-04 | Available |
| KO4SY | 10 | 61 | 2033-09-21 | — | Active |
| KO4SZ | 10 | 59 | — | — | Available |
| KO4TA | 9 | 51 | 2032-03-03 | — | Active |
| KO4TB | 9 | 55 | 2022-03-03 | 2024-03-04 | Available |
| KO4TC | 9 | 57 | 2022-03-03 | 2024-03-04 | Available |
| KO4TD | 9 | 53 | 2032-03-03 | — | Active |
| KO4TE | 9 | 47 | 2006-08-04 | 2008-08-05 | Available |
| KO4TF | 9 | 55 | 2031-09-29 | — | Active |
| KO4TG | 8 | 55 | 2012-03-19 | 2014-03-20 | Available |
| KO4TH | 9 | 53 | 2031-12-04 | — | Active (Vanity) |
| KO4TI | 10 | 49 | 2012-10-22 | 2014-10-23 | Available |
| KO4TJ | 10 | 59 | — | — | Available |
| KO4TK | 9 | 55 | — | — | Available |
| KO4TL | 9 | 55 | 2033-03-04 | — | Active (Vanity) |
| KO4TM | 8 | 53 | 2031-01-25 | — | Active (Vanity) |
| KO4TN | 10 | 51 | 2032-03-10 | — | Active |
| KO4TO | 9 | 57 | 2033-03-11 | — | Active |
| KO4TP | 9 | 57 | 2033-03-23 | — | Active |
| KO4TQ | 9 | 59 | — | — | Available |
| KO4TR | 10 | 53 | 2032-04-06 | — | Active |
| KO4TS | 10 | 51 | 2032-09-29 | — | Active |
| KO4TT | 9 | 49 | 2033-01-26 | — | Active |
| KO4TU | 10 | 53 | 2032-07-21 | — | Active |
| KO4TV | 9 | 55 | 2032-05-06 | — | Active |
| KO4TW | 9 | 55 | — | — | Available |
| KO4TX | 9 | 57 | 2031-03-09 | — | Active (Vanity) |
| KO4TY | 9 | 59 | 1998-03-18 | 2000-03-19 | Available |
| KO4TZ | 9 | 57 | 2017-03-07 | 2019-03-08 | Available |
| KO4UA | 10 | 55 | 2032-04-03 | — | Active |
| KO4UB | 10 | 59 | 1997-09-17 | 1999-09-18 | Available |
| KO4UC | 10 | 61 | 2033-08-03 | — | Active |
| KO4UD | 10 | 57 | — | — | Available |
| KO4UE | 10 | 51 | 2033-01-05 | — | Active |
| KO4UF | 10 | 59 | — | — | Available |
| KO4UG | 9 | 59 | — | — | Available |
| KO4UH | 10 | 57 | 2002-03-24 | 2004-03-25 | Available |