District 4
1x3 Callsigns (100)
| Callsign | Phonetic | Morse | End Date | Available Date | Status |
|---|---|---|---|---|---|
| N4UAO | 11 | 51 | 2008-10-02 | 2010-10-03 | Available |
| N4UAP | 11 | 51 | — | — | Available |
| N4UAQ | 11 | 53 | 1998-10-04 | 2000-10-05 | Available |
| N4UAR | 12 | 47 | 2030-04-02 | — | Active (Vanity) |
| N4UAS | 12 | 45 | 2033-03-30 | — | Active |
| N4UAT | 11 | 43 | 2027-07-25 | — | Active (Vanity) |
| N4UAU | 12 | 47 | 2031-06-11 | — | Active |
| N4UAV | 11 | 49 | 2036-03-22 | — | Active (Vanity) |
| N4UAW | 11 | 49 | 2012-09-15 | 2014-09-16 | Available |
| N4UAX | 11 | 51 | 2034-05-10 | — | Active (Vanity) |
| N4UAY | 11 | 53 | 2030-03-27 | — | Active |
| N4UAZ | 11 | 51 | 2018-12-14 | 2020-12-15 | Available |
| N4UBA | 11 | 49 | 2018-06-12 | 2020-06-13 | Available |
| N4UBB | 11 | 53 | 2018-06-12 | 2020-06-13 | Available |
| N4UBC | 11 | 55 | 2030-10-11 | — | Active |
| N4UBD | 11 | 51 | 2000-11-14 | 2002-11-15 | Available |
| N4UBE | 11 | 45 | 1998-03-20 | 2000-03-21 | Available |
| N4UBF | 11 | 53 | — | — | Available |
| N4UBG | 10 | 53 | 2028-12-19 | — | Active |
| N4UBH | 11 | 51 | 2031-12-03 | — | Active |
| N4UBI | 12 | 47 | 2010-05-18 | 2012-05-19 | Available |
| N4UBJ | 12 | 57 | 2019-06-10 | 2021-06-11 | Available |
| N4UBK | 11 | 53 | 2012-07-21 | 2014-07-22 | Available |
| N4UBL | 11 | 53 | — | — | Available |
| N4UBM | 10 | 51 | 2008-09-10 | 2010-09-11 | Available |
| N4UBN | 12 | 49 | 2009-02-17 | 2011-02-18 | Available |
| N4UBO | 11 | 55 | 2031-09-03 | — | Active |
| N4UBP | 11 | 55 | 2018-06-19 | 2020-06-20 | Available |
| N4UBQ | 11 | 57 | — | — | Available |
| N4UBR | 12 | 51 | 2028-09-17 | — | Active |
| N4UBS | 12 | 49 | 1999-01-13 | 2001-01-14 | Available |
| N4UBT | 11 | 47 | 2018-09-11 | 2020-09-12 | Available |
| N4UBU | 12 | 51 | 2032-01-28 | — | Active (Vanity) |
| N4UBV | 11 | 53 | 2008-09-14 | 2010-09-15 | Available |
| N4UBW | 11 | 53 | 1998-10-11 | 2000-10-12 | Available |
| N4UBX | 11 | 55 | 2023-02-16 | 2025-02-17 | Available |
| N4UBY | 11 | 57 | 2010-05-01 | 2012-05-02 | Available |
| N4UBZ | 11 | 55 | 2028-08-26 | — | Active |
| N4UCA | 11 | 51 | 2010-01-11 | 2012-01-12 | Available |
| N4UCB | 11 | 55 | 1998-10-11 | 2000-10-12 | Available |
| N4UCC | 11 | 57 | 1998-10-11 | 2000-10-12 | Available |
| N4UCD | 11 | 53 | 1998-10-11 | 2000-10-12 | Available |
| N4UCE | 11 | 47 | 1998-10-11 | 2000-10-12 | Available |
| N4UCF | 11 | 55 | 2033-06-22 | — | Active (Vanity) |
| N4UCG | 10 | 55 | 2008-08-05 | 2010-08-06 | Available |
| N4UCH | 11 | 53 | 2029-08-11 | — | Active |
| N4UCI | 12 | 49 | 2008-06-23 | 2010-06-24 | Available |
| N4UCJ | 12 | 59 | 2018-06-15 | 2020-06-16 | Available |
| N4UCK | 11 | 55 | 1997-09-17 | 1999-09-18 | Available |
| N4UCL | 11 | 55 | 2018-08-18 | 2020-08-19 | Available |
| N4UCM | 10 | 53 | 2028-09-22 | — | Active |
| N4UCN | 12 | 51 | — | — | Available |
| N4UCO | 11 | 57 | 2032-04-07 | — | Active |
| N4UCP | 11 | 57 | 2028-10-28 | — | Active |
| N4UCQ | 11 | 59 | 2028-06-25 | — | Active |
| N4UCR | 12 | 53 | 2009-04-27 | 2011-04-28 | Available |
| N4UCS | 12 | 51 | 2015-10-06 | 2017-10-07 | Available |
| N4UCT | 11 | 49 | 1998-12-20 | 2000-12-21 | Available |
| N4UCU | 12 | 53 | 2032-09-22 | — | Active |
| N4UCV | 11 | 55 | 2004-08-24 | 2006-08-25 | Available |
| N4UCW | 11 | 55 | 2028-06-17 | — | Active |
| N4UCX | 11 | 57 | — | — | Available |
| N4UCY | 11 | 59 | 2029-05-05 | — | Active |
| N4UCZ | 11 | 57 | 2010-10-30 | 2012-10-31 | Available |
| N4UDA | 11 | 47 | 2018-12-16 | 2020-12-17 | Available |
| N4UDB | 11 | 51 | 1999-09-19 | 2001-09-20 | Available |
| N4UDC | 11 | 53 | 2018-10-27 | 2020-10-28 | Available |
| N4UDD | 11 | 49 | 2028-06-12 | — | Active |
| N4UDE | 11 | 43 | 2036-08-18 | — | Active (Vanity) |
| N4UDF | 11 | 51 | — | — | Available |
| N4UDG | 10 | 51 | 2035-04-04 | — | Active (Vanity) |
| N4UDH | 11 | 49 | 1998-10-25 | 2000-10-26 | Available |
| N4UDI | 12 | 45 | 1998-10-25 | 2000-10-26 | Available |
| N4UDJ | 12 | 55 | 2034-03-09 | — | Active (Vanity) |
| N4UDK | 11 | 51 | 2029-05-21 | — | Active |
| N4UDL | 11 | 51 | 1998-10-25 | 2000-10-26 | Available |
| N4UDM | 10 | 49 | 2008-07-09 | 2010-07-10 | Available |
| N4UDN | 12 | 47 | 1998-10-25 | 2000-10-26 | Available |
| N4UDO | 11 | 53 | — | — | Available |
| N4UDP | 11 | 53 | 2030-01-18 | — | Active (Vanity) |
| N4UDQ | 11 | 55 | 2028-06-25 | — | Active |
| N4UDR | 12 | 49 | — | — | Available |
| N4UDS | 12 | 47 | 2030-02-13 | — | Active |
| N4UDT | 11 | 45 | 2018-09-05 | 2020-09-06 | Available |
| N4UDU | 12 | 49 | 2018-06-16 | 2020-06-17 | Available |
| N4UDV | 11 | 51 | 2033-10-05 | — | Active |
| N4UDW | 11 | 51 | — | — | Available |
| N4UDX | 11 | 53 | 2029-11-14 | — | Active |
| N4UDY | 11 | 55 | 2008-12-30 | 2010-12-31 | Available |
| N4UDZ | 11 | 53 | 2032-02-26 | — | Active |
| N4UEA | 11 | 41 | 2028-08-25 | — | Active |
| N4UEB | 11 | 45 | 2024-03-05 | 2026-03-06 | Available |
| N4UEC | 11 | 47 | 1998-10-25 | 2000-10-26 | Available |
| N4UED | 11 | 43 | 2023-04-28 | 2025-04-29 | Available |
| N4UEE | 11 | 37 | — | — | Available |
| N4UEF | 11 | 45 | 2027-11-26 | — | Active |
| N4UEG | 10 | 45 | — | — | Available |
| N4UEH | 11 | 43 | 2008-08-18 | 2010-08-19 | Available |
| N4UEI | 12 | 39 | — | — | Available |
| N4UEJ | 12 | 49 | 1998-10-25 | 2000-10-26 | Available |