District 4
2x2 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| AI4SA | 11 | 41 | 2013-07-26 | 2015-07-27 | Available |
| AI4SB | 11 | 45 | 2007-02-08 | 2009-02-09 | Available |
| AI4SC | 11 | 47 | 2036-07-25 | — | Active |
| AI4SD | 11 | 43 | 2016-05-15 | 2018-05-16 | Available |
| AI4SE | 11 | 37 | 2006-10-31 | 2008-11-01 | Available |
| AI4SF | 11 | 45 | 2006-11-14 | 2008-11-15 | Available |
| AI4SG | 10 | 45 | 2025-10-27 | — | Active |
| AI4SH | 11 | 43 | 2032-10-18 | — | Active |
| AI4SI | 12 | 39 | 2030-03-21 | — | Active |
| AI4SJ | 12 | 49 | 2011-11-15 | 2013-11-16 | Available |
| AI4SK | 11 | 45 | 2026-11-18 | — | Active |
| AI4SL | 11 | 45 | 2029-01-25 | — | Active |
| AI4SM | 10 | 43 | 2019-01-25 | 2021-01-26 | Available |
| AI4SN | 12 | 41 | 2026-11-15 | — | Active |
| AI4SO | 11 | 47 | 2031-01-31 | — | Active |
| AI4SP | 11 | 47 | 2036-06-19 | — | Active |
| AI4SQ | 11 | 49 | 2006-12-27 | 2008-12-28 | Available |
| AI4SR | 12 | 43 | 2030-04-13 | — | Active (Vanity) |
| AI4SS | 12 | 41 | 2031-02-26 | — | Active |
| AI4ST | 11 | 39 | 2033-09-28 | — | Active |
| AI4SU | 12 | 43 | 2011-03-29 | 2013-03-30 | Available |
| AI4SV | 11 | 45 | 2034-03-08 | — | Active |
| AI4SW | 11 | 45 | 2034-06-16 | — | Active |
| AI4SX | 11 | 47 | 2029-04-12 | — | Active |
| AI4SY | 11 | 49 | 2029-05-27 | — | Active (Vanity) |
| AI4SZ | 11 | 47 | 2007-03-06 | 2009-03-07 | Available |
| AI4TA | 10 | 39 | 2036-08-22 | — | Active |
| AI4TB | 10 | 43 | 2032-08-19 | — | Active (Vanity) |
| AI4TC | 10 | 45 | 2027-12-13 | — | Active |
| AI4TD | 10 | 41 | 2036-01-06 | — | Active (Vanity) |
| AI4TE | 10 | 35 | 2024-09-14 | 2026-09-15 | Available |
| AI4TF | 10 | 43 | 2017-04-29 | 2019-04-30 | Available |
| AI4TG | 9 | 43 | 2023-01-12 | 2025-01-13 | Available |
| AI4TH | 10 | 41 | 2034-05-31 | — | Active (Vanity) |
| AI4TI | 11 | 37 | 2036-09-12 | — | Active |
| AI4TJ | 11 | 47 | 2017-02-16 | 2019-02-17 | Available |
| AI4TK | 10 | 43 | 2034-03-23 | — | Active (Vanity) |
| AI4TL | 10 | 43 | 2029-12-26 | — | Active |
| AI4TM | 9 | 41 | 2035-01-17 | — | Active (Vanity) |
| AI4TN | 11 | 39 | 2022-04-24 | 2024-04-25 | Available |
| AI4TO | 10 | 45 | 2036-01-18 | — | Active |
| AI4TP | 10 | 45 | 2017-01-19 | 2019-01-20 | Available |
| AI4TQ | 10 | 47 | 2008-08-12 | 2010-08-13 | Available |
| AI4TR | 11 | 41 | 2029-02-20 | — | Active (Vanity) |
| AI4TS | 11 | 39 | 2035-01-31 | — | Active (Vanity) |
| AI4TT | 10 | 37 | 2029-02-14 | — | Active (Vanity) |
| AI4TU | 11 | 41 | 2026-07-30 | — | Active |
| AI4TV | 10 | 43 | 2007-09-05 | 2009-09-06 | Available |
| AI4TW | 10 | 43 | 2007-09-07 | 2009-09-08 | Available |
| AI4TX | 10 | 45 | 2035-04-22 | — | Active (Vanity) |
| AI4TY | 10 | 47 | 2027-02-28 | — | Active |
| AI4TZ | 10 | 45 | 2025-01-15 | — | Active |
| AI4UA | 11 | 43 | 2007-03-23 | 2009-03-24 | Available |
| AI4UB | 11 | 47 | 2030-04-01 | — | Active |
| AI4UC | 11 | 49 | 2033-06-29 | — | Active |
| AI4UD | 11 | 45 | 2027-03-05 | — | Active |
| AI4UE | 11 | 39 | 2033-04-21 | — | Active |
| AI4UF | 11 | 47 | 2035-01-14 | — | Active (Vanity) |
| AI4UG | 10 | 47 | 2013-11-25 | 2015-11-26 | Available |
| AI4UH | 11 | 45 | 2029-10-12 | — | Active |
| AI4UI | 12 | 41 | 2027-03-20 | — | Active |
| AI4UJ | 12 | 51 | 2016-04-24 | 2018-04-25 | Available |
| AI4UK | 11 | 47 | 2031-06-12 | — | Active (Vanity) |
| AI4UL | 11 | 47 | 2027-03-06 | — | Active |
| AI4UM | 10 | 45 | 2006-12-04 | 2008-12-05 | Available |
| AI4UN | 12 | 43 | 2027-03-07 | — | Active |
| AI4UO | 11 | 49 | 2007-03-30 | 2009-03-31 | Available |
| AI4UP | 11 | 49 | 2032-06-30 | — | Active |
| AI4UQ | 11 | 51 | 2027-03-08 | — | Active |
| AI4UR | 12 | 45 | 2036-09-11 | — | Active |
| AI4US | 12 | 43 | 2035-02-04 | — | Active (Vanity) |
| AI4UT | 11 | 41 | 2027-04-08 | — | Active |
| AI4UU | 12 | 45 | 2007-04-10 | 2009-04-11 | Available |
| AI4UV | 11 | 47 | 2007-04-13 | 2009-04-14 | Available |
| AI4UW | 11 | 47 | 2033-02-11 | — | Active |
| AI4UX | 11 | 49 | 2018-06-29 | 2020-06-30 | Available |
| AI4UY | 11 | 51 | 2033-11-25 | — | Active |
| AI4UZ | 11 | 49 | 2031-04-02 | — | Active |
| AI4VA | 10 | 45 | 2015-10-31 | 2017-11-01 | Available |
| AI4VB | 10 | 49 | 2007-04-10 | 2009-04-11 | Available |
| AI4VC | 10 | 51 | 2027-03-13 | — | Active |
| AI4VD | 10 | 47 | 2008-03-21 | 2010-03-22 | Available |
| AI4VE | 10 | 41 | 2027-07-29 | — | Active |
| AI4VF | 10 | 49 | 2027-03-14 | — | Active |
| AI4VG | 9 | 49 | 2036-11-06 | — | Active |
| AI4VH | 10 | 47 | 2028-12-27 | — | Active |
| AI4VI | 11 | 43 | 2033-10-26 | — | Active |
| AI4VJ | 11 | 53 | 2027-03-08 | — | Active |
| AI4VK | 10 | 49 | 2030-09-18 | — | Active |
| AI4VL | 10 | 49 | 2014-07-28 | 2016-07-29 | Available |
| AI4VM | 9 | 47 | 2008-03-01 | 2010-03-02 | Available |
| AI4VN | 11 | 45 | 2008-03-15 | 2010-03-16 | Available |
| AI4VO | 10 | 51 | 2027-01-25 | — | Active |
| AI4VP | 10 | 51 | 2027-03-21 | — | Active |
| AI4VQ | 10 | 53 | 2017-03-22 | 2019-03-23 | Available |
| AI4VR | 11 | 47 | 2025-06-29 | — | Active |
| AI4VS | 11 | 45 | 2032-03-31 | — | Active |
| AI4VT | 10 | 43 | 2017-03-23 | 2019-03-24 | Available |
| AI4VU | 11 | 47 | 2027-03-26 | — | Active |
| AI4VV | 10 | 49 | 2024-07-07 | 2026-07-08 | Available |