KB4DU
Unknown2x2Zone 4
License HolderWILLIS, JOHN R
License ClassAdvanced
Min. Class RequiredGeneral
Requires General license or higher to apply for this callsign format (2x2).
License History
- Administrative Update AppliedMay 4, 2026
- License RenewedApr 3, 2026
- License RenewedOct 4, 2014
- License ModifiedJul 11, 2014
- License RenewedDec 31, 2004
- FRN Association Letter SentDec 31, 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.