District 4
2x2 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| KF4RS | 11 | 53 | 1997-12-15 | 1999-12-16 | Available |
| KF4RT | 10 | 51 | 2013-09-07 | 2015-09-08 | Available |
| KF4RU | 11 | 55 | 2018-06-10 | 2020-06-11 | Available |
| KF4RV | 10 | 57 | 2008-06-16 | 2010-06-17 | Available |
| KF4RW | 10 | 57 | — | — | Available |
| KF4RX | 10 | 59 | 2029-07-12 | — | Active |
| KF4RY | 10 | 61 | — | — | Available |
| KF4RZ | 10 | 59 | 2000-01-23 | 2002-01-24 | Available |
| KF4SA | 10 | 51 | 2028-04-20 | — | Active |
| KF4SB | 10 | 55 | 2007-10-21 | 2009-10-22 | Available |
| KF4SC | 10 | 57 | 2028-04-10 | — | Active |
| KF4SD | 10 | 53 | 2010-11-06 | 2012-11-07 | Available |
| KF4SE | 10 | 47 | 2019-06-03 | 2021-06-04 | Available |
| KF4SF | 10 | 55 | 2018-10-19 | 2020-10-20 | Available |
| KF4SG | 9 | 55 | — | — | Available |
| KF4SH | 10 | 53 | — | — | Available |
| KF4SI | 11 | 49 | — | — | Available |
| KF4SJ | 11 | 59 | 2032-05-12 | — | Active |
| KF4SK | 10 | 55 | — | — | Available |
| KF4SL | 10 | 55 | — | — | Available |
| KF4SM | 9 | 53 | — | — | Available |
| KF4SN | 11 | 51 | 2018-07-29 | 2020-07-30 | Available |
| KF4SO | 10 | 57 | — | — | Available |
| KF4SP | 10 | 57 | 2012-09-08 | 2014-09-09 | Available |
| KF4SQ | 10 | 59 | 2017-11-19 | 2019-11-20 | Available |
| KF4SR | 11 | 53 | 2035-05-09 | — | Active (Vanity) |
| KF4SS | 11 | 51 | 2035-04-22 | — | Active (Vanity) |
| KF4ST | 10 | 49 | — | — | Available |
| KF4SU | 11 | 53 | 2025-07-08 | 2027-07-09 | Canceled (grace period) |
| KF4SV | 10 | 55 | 2027-10-23 | — | Active |
| KF4SW | 10 | 55 | 2008-04-24 | 2010-04-25 | Available |
| KF4SX | 10 | 57 | — | — | Available |
| KF4SY | 10 | 59 | — | — | Available |
| KF4SZ | 10 | 57 | 2008-01-12 | 2010-01-13 | Available |
| KF4TA | 9 | 49 | 2031-11-05 | — | Active |
| KF4TB | 9 | 53 | — | — | Available |
| KF4TC | 9 | 55 | 2035-07-07 | — | Active (Vanity) |
| KF4TD | 9 | 51 | 2031-06-29 | — | Active |
| KF4TE | 9 | 45 | 2025-06-19 | — | Active |
| KF4TF | 9 | 53 | — | — | Available |
| KF4TG | 8 | 53 | — | — | Available |
| KF4TH | 9 | 51 | 2014-07-11 | 2016-07-12 | Available |
| KF4TI | 10 | 47 | 1998-02-02 | 2000-02-03 | Available |
| KF4TJ | 10 | 57 | 2007-10-22 | 2009-10-23 | Available |
| KF4TK | 9 | 53 | 2031-04-16 | — | Active |
| KF4TL | 9 | 53 | 2020-10-22 | 2022-10-23 | Available |
| KF4TM | 8 | 51 | 2000-05-13 | 2002-05-14 | Available |
| KF4TN | 10 | 49 | 2007-12-02 | 2009-12-03 | Available |
| KF4TO | 9 | 55 | 1998-03-22 | 2000-03-23 | Available |
| KF4TP | 9 | 55 | 2028-01-13 | — | Active |
| KF4TQ | 9 | 57 | 2032-06-23 | — | Active |
| KF4TR | 10 | 51 | 1998-09-13 | 2000-09-14 | Available |
| KF4TS | 10 | 49 | 2018-04-08 | 2020-04-09 | Available |
| KF4TT | 9 | 47 | 2028-01-09 | — | Active (Vanity) |
| KF4TU | 10 | 51 | 2028-11-24 | — | Active |
| KF4TV | 9 | 53 | 2027-10-27 | — | Active |
| KF4TW | 9 | 53 | 2028-01-28 | — | Active |
| KF4TX | 9 | 55 | 2029-07-27 | — | Active (Vanity) |
| KF4TY | 9 | 57 | 2031-03-16 | — | Active (Vanity) |
| KF4TZ | 9 | 55 | — | — | Available |
| KF4UA | 10 | 53 | 2008-04-01 | 2010-04-02 | Available |
| KF4UB | 10 | 57 | 2028-01-05 | — | Active |
| KF4UC | 10 | 59 | 2017-10-07 | 2019-10-08 | Available |
| KF4UD | 10 | 55 | 2008-01-16 | 2010-01-17 | Available |
| KF4UE | 10 | 49 | — | — | Available |
| KF4UF | 10 | 57 | 2027-12-19 | — | Active |
| KF4UG | 9 | 57 | — | — | Available |
| KF4UH | 10 | 55 | — | — | Available |
| KF4UI | 11 | 51 | — | — | Available |
| KF4UJ | 11 | 61 | 1998-09-06 | 2000-09-07 | Available |
| KF4UK | 10 | 57 | — | — | Available |
| KF4UL | 10 | 57 | — | — | Available |
| KF4UM | 9 | 55 | 2007-11-18 | 2009-11-19 | Available |
| KF4UN | 11 | 53 | 2027-11-05 | — | Active |
| KF4UO | 10 | 59 | 2028-01-05 | — | Active |
| KF4UP | 10 | 59 | — | — | Available |
| KF4UQ | 10 | 61 | — | — | Available |
| KF4UR | 11 | 55 | 1998-08-23 | 2000-08-24 | Available |
| KF4US | 11 | 53 | 2007-04-14 | 2009-04-15 | Available |
| KF4UT | 10 | 51 | 1998-03-22 | 2000-03-23 | Available |
| KF4UU | 11 | 55 | 1998-10-05 | 2000-10-06 | Available |
| KF4UV | 10 | 57 | — | — | Available |
| KF4UW | 10 | 57 | — | — | Available |
| KF4UX | 10 | 59 | — | — | Available |
| KF4UY | 10 | 61 | 2036-11-20 | — | Active |
| KF4UZ | 10 | 59 | 2001-07-06 | 2003-07-07 | Available |
| KF4VA | 9 | 55 | 2029-01-15 | — | Active |
| KF4VB | 9 | 59 | 2035-08-02 | — | Active |
| KF4VC | 9 | 61 | 1997-09-29 | 1999-09-30 | Available |
| KF4VD | 9 | 57 | — | — | Available |
| KF4VE | 9 | 51 | 2028-02-02 | — | Active |
| KF4VF | 9 | 59 | 2002-03-07 | 2004-03-08 | Available |
| KF4VG | 8 | 59 | — | — | Available |
| KF4VH | 9 | 57 | — | — | Available |
| KF4VI | 10 | 53 | 2000-08-15 | 2002-08-16 | Available |
| KF4VJ | 10 | 63 | 2017-11-19 | 2019-11-20 | Available |
| KF4VK | 9 | 59 | 2018-02-25 | 2020-02-26 | Available |
| KF4VL | 9 | 59 | — | — | Available |
| KF4VM | 8 | 57 | 2021-10-10 | 2023-10-11 | Available |
| KF4VN | 10 | 55 | 2028-01-23 | — | Active |