KR4OK
Unknown2x2Zone 4
License HolderALDERFER, JEFFREY M
License ClassAdvanced
Min. Class RequiredGeneral
Requires General license or higher to apply for this callsign format (2x2).
License History
- Administrative Update AppliedJul 25, 2025
- Administrative Update AppliedJul 25, 2025
- Administrative Update AppliedJul 25, 2025
- Administrative Update AppliedAug 25, 2021
- Administrative Update AppliedAug 23, 2021
- License RenewedSep 25, 2018
- Vanity Callsign GrantedDec 23, 2008
- License IssuedDec 23, 2008
- License CanceledApr 22, 2008
- Vanity Callsign GrantedNov 1, 2003
- License IssuedNov 1, 2003
- License CanceledOct 17, 2000
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
No competing applications detected. Monitor the FCC ULS application search to verify before filing.