KO4USR
Active2x3District 4
Competitive callsign — 1 application filed with the FCC.
License HolderHolley, Michael
License ClassGeneral
Min. Class RequiredTechnician
LocationMapleton, UT
Grant DateJun 13, 2026
Expiration DateJun 13, 2036
KO4USR is a highly sought-after 2x3 format amateur radio callsign. The license is currently held by Holley, Michael in Mapleton, UT. This callsign has attracted significant interest in the amateur radio community, with 1 vanity application filed with the FCC. The most recent was submitted by Holley, Michael on May 26, 2026. KO4USR has 5 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- --- ....- ..- ... .-.
CW Weight: 36 units(Moderate)
Voice Phonetics
Kilo Oscar Four Uniform Sierra Romeo
Readability: 6/10(Good readability)
License History
- License IssuedJun 13, 2026
- Vanity Callsign GrantedJun 13, 2026
- License CanceledMay 6, 2023
- System-Generated GrantNov 15, 2021
- License IssuedNov 15, 2021
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- Holley, MichaelFiled May 26, 2026Not awardedFCC ↗