District 4
2x2 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| KU4RG | 10 | 55 | 2000-07-18 | 2002-07-19 | Available |
| KU4RH | 11 | 53 | 2015-11-30 | 2017-12-01 | Available |
| KU4RI | 12 | 49 | 2007-10-21 | 2009-10-22 | Available |
| KU4RJ | 12 | 59 | 2004-04-13 | 2006-04-14 | Available |
| KU4RK | 11 | 55 | 2035-11-22 | — | Active |
| KU4RL | 11 | 55 | 2014-07-09 | 2016-07-10 | Available |
| KU4RM | 10 | 53 | 2000-06-03 | 2002-06-04 | Available |
| KU4RN | 12 | 51 | 2035-06-22 | — | Active |
| KU4RO | 11 | 57 | 2028-03-08 | — | Active |
| KU4RP | 11 | 57 | 2033-04-20 | — | Active |
| KU4RQ | 11 | 59 | 1998-09-15 | 2000-09-16 | Available |
| KU4RR | 12 | 53 | 2014-02-08 | 2016-02-09 | Available |
| KU4RS | 12 | 51 | 2000-05-05 | 2002-05-06 | Available |
| KU4RT | 11 | 49 | 2033-05-31 | — | Active |
| KU4RU | 12 | 53 | 2000-05-10 | 2002-05-11 | Available |
| KU4RV | 11 | 55 | 2006-11-21 | 2008-11-22 | Available |
| KU4RW | 11 | 55 | 2020-09-15 | 2022-09-16 | Available |
| KU4RX | 11 | 57 | 2000-05-20 | 2002-05-21 | Available |
| KU4RY | 11 | 59 | 2028-01-23 | — | Active |
| KU4RZ | 11 | 57 | 2018-05-15 | 2020-05-16 | Available |
| KU4SA | 11 | 49 | 2023-09-28 | 2025-09-29 | Available |
| KU4SB | 11 | 53 | 1999-01-20 | 2001-01-21 | Available |
| KU4SC | 11 | 55 | 2000-10-28 | 2002-10-29 | Available |
| KU4SD | 11 | 51 | 2035-01-12 | — | Active |
| KU4SE | 11 | 45 | 2028-10-04 | — | Active |
| KU4SF | 11 | 53 | 2018-04-20 | 2020-04-21 | Available |
| KU4SG | 10 | 53 | 2014-03-15 | 2016-03-16 | Available |
| KU4SH | 11 | 51 | 2004-08-28 | 2006-08-29 | Available |
| KU4SI | 12 | 47 | 2018-05-22 | 2020-05-23 | Available |
| KU4SJ | 12 | 57 | 2007-12-17 | 2009-12-18 | Available |
| KU4SK | 11 | 53 | 1998-09-29 | 2000-09-30 | Available |
| KU4SL | 11 | 53 | 2011-08-13 | 2013-08-14 | Available |
| KU4SM | 10 | 51 | 2028-07-01 | — | Active |
| KU4SN | 12 | 49 | 2016-09-25 | 2018-09-26 | Available |
| KU4SO | 11 | 55 | 1998-07-15 | 2000-07-16 | Available |
| KU4SP | 11 | 55 | 2001-02-13 | 2003-02-14 | Available |
| KU4SQ | 11 | 57 | 2018-06-08 | 2020-06-09 | Available |
| KU4SR | 12 | 51 | 2008-03-05 | 2010-03-06 | Available |
| KU4SS | 12 | 49 | 1998-07-13 | 2000-07-14 | Available |
| KU4ST | 11 | 47 | 2028-02-20 | — | Active |
| KU4SU | 12 | 51 | 2000-04-28 | 2002-04-29 | Available |
| KU4SV | 11 | 53 | 2028-04-18 | — | Active |
| KU4SW | 11 | 53 | 2029-01-21 | — | Active |
| KU4SX | 11 | 55 | 2000-07-15 | 2002-07-16 | Available |
| KU4SY | 11 | 57 | 1999-03-23 | 2001-03-24 | Available |
| KU4SZ | 11 | 55 | 2018-03-20 | 2020-03-21 | Available |
| KU4TA | 10 | 47 | 1999-05-27 | 2001-05-28 | Available |
| KU4TB | 10 | 51 | 2027-12-30 | — | Active |
| KU4TC | 10 | 53 | 2007-06-19 | 2009-06-20 | Available |
| KU4TD | 10 | 49 | 1998-11-19 | 2000-11-20 | Available |
| KU4TE | 10 | 43 | 1998-08-19 | 2000-08-20 | Available |
| KU4TF | 10 | 51 | 2005-05-17 | 2007-05-18 | Available |
| KU4TG | 9 | 51 | 1998-08-11 | 2000-08-12 | Available |
| KU4TH | 10 | 49 | 2003-08-08 | 2005-08-09 | Available |
| KU4TI | 11 | 45 | 2022-02-15 | 2024-02-16 | Available |
| KU4TJ | 11 | 55 | 2027-12-08 | — | Active |
| KU4TK | 10 | 51 | 2000-05-24 | 2002-05-25 | Available |
| KU4TL | 10 | 51 | 2007-05-15 | 2009-05-16 | Available |
| KU4TM | 9 | 49 | 2035-09-01 | — | Active |
| KU4TN | 11 | 47 | 2027-04-18 | — | Active |
| KU4TO | 10 | 53 | 2003-11-29 | 2005-11-30 | Available |
| KU4TP | 10 | 53 | 2036-08-07 | — | Active |
| KU4TQ | 10 | 55 | 2004-07-15 | 2006-07-16 | Available |
| KU4TR | 11 | 49 | 1999-07-18 | 2001-07-19 | Available |
| KU4TS | 11 | 47 | 2007-01-21 | 2009-01-22 | Available |
| KU4TT | 10 | 45 | 2028-07-23 | — | Active |
| KU4TU | 11 | 49 | 1998-09-23 | 2000-09-24 | Available |
| KU4TV | 10 | 51 | 2028-07-30 | — | Active |
| KU4TW | 10 | 51 | 2030-01-11 | — | Active |
| KU4TX | 10 | 53 | 2029-02-28 | — | Active |
| KU4TY | 10 | 55 | 1999-10-23 | 2001-10-24 | Available |
| KU4TZ | 10 | 53 | 1998-08-30 | 2000-08-31 | Available |
| KU4UA | 11 | 51 | 2006-11-04 | 2008-11-05 | Available |
| KU4UB | 11 | 55 | 2008-08-10 | 2010-08-11 | Available |
| KU4UC | 11 | 57 | 2032-09-02 | — | Active (Vanity) |
| KU4UD | 11 | 53 | 2028-08-18 | — | Active |
| KU4UE | 11 | 47 | 2027-05-30 | — | Active |
| KU4UF | 11 | 55 | 1999-11-20 | 2001-11-21 | Available |
| KU4UG | 10 | 55 | 1998-11-12 | 2000-11-13 | Available |
| KU4UH | 11 | 53 | 2035-08-04 | — | Active |
| KU4UI | 12 | 49 | 2014-07-22 | 2016-07-23 | Available |
| KU4UJ | 12 | 59 | 2036-06-10 | — | Active |
| KU4UK | 11 | 55 | 2033-11-09 | — | Active (Vanity) |
| KU4UL | 11 | 55 | 1999-09-30 | 2001-10-01 | Available |
| KU4UM | 10 | 53 | 1998-09-17 | 2000-09-18 | Available |
| KU4UN | 12 | 51 | 1999-06-02 | 2001-06-03 | Available |
| KU4UO | 11 | 57 | 2027-11-17 | — | Active |
| KU4UP | 11 | 57 | 2026-03-11 | — | Active |
| KU4UQ | 11 | 59 | 2024-10-19 | 2026-10-20 | Available |
| KU4UR | 12 | 53 | 1998-10-12 | 2000-10-13 | Available |
| KU4US | 12 | 51 | 2027-06-30 | — | Active |
| KU4UT | 11 | 49 | 1998-10-10 | 2000-10-11 | Available |
| KU4UU | 12 | 53 | 1998-11-17 | 2000-11-18 | Available |
| KU4UV | 11 | 55 | 2032-12-29 | — | Active |
| KU4UW | 11 | 55 | 2027-05-05 | — | Active |
| KU4UX | 11 | 57 | 1998-12-30 | 2000-12-31 | Available |
| KU4UY | 11 | 59 | 2000-07-04 | 2002-07-05 | Available |
| KU4UZ | 11 | 57 | 2026-11-21 | — | Active |
| KU4VA | 10 | 53 | 2028-03-13 | — | Active |
| KU4VB | 10 | 57 | 2027-11-23 | — | Active (Vanity) |