KR4SF
Unknown2x2Zone 4
License HolderWARNER II, CHARLES L
License ClassAdvanced
Min. Class RequiredGeneral
Requires General license or higher to apply for this callsign format (2x2).
License History
- License RenewedDec 9, 2025
- Administrative Update AppliedApr 9, 2020
- Administrative Update AppliedJul 13, 2019
- License RenewedFeb 5, 2016
- License RenewedJul 6, 2005
- FRN Association Letter SentJul 6, 2005
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.