KR4OX
Unknown2x2Zone 4
License HolderUNDERWOOD, CHARLES R
License ClassAdvanced
Min. Class RequiredGeneral
Requires General license or higher to apply for this callsign format (2x2).
License History
- License ExpiredMar 24, 2026
- License RenewedJan 2, 2014
- Administrative Update AppliedJan 12, 2012
- License ModifiedNov 16, 2011
- License RenewedFeb 3, 2004
- License RenewedFeb 3, 2004
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.