KB4DU
Active2x2District 4
No competing applications on record.
License HolderSPENCER, MARK G
License ClassTechnician
Min. Class RequiredGeneral
LocationLINDSAY, OK
Grant DateApr 3, 2026
Expiration DateDec 31, 2034
KB4DU is a 2x2 format amateur radio callsign. It is currently registered to SPENCER, MARK G in LINDSAY, OK. There are currently no competing vanity applications or pending FCC filings on record for this callsign. Add it to your watchlist to receive an immediate alert if another operator files a vanity application.
CW & Voice Analysis
Morse Code
-.- -... ....- -.. ..-
CW Weight: 30 units(Light (fast to send))
Voice Phonetics
Kilo Bravo Four Delta Uniform
Readability: 7.5/10(High readability)
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 on record. Verify on the FCC ULS application search before filing.