KO4K
Active2x1District 4
Competitive callsign — 6 applications filed with the FCC.
License HolderNEFF, ROBERT H
License ClassAmateur Extra
Min. Class RequiredAmateur Extra
LocationMCLEAN, VA
Grant DateMar 12, 2026
Expiration DateMay 16, 2036
KO4K is a highly sought-after 2x1 format amateur radio callsign. The license is currently held by NEFF, ROBERT H in MCLEAN, VA. This callsign has attracted significant interest in the amateur radio community, with 6 vanity applications filed with the FCC. The most recent was submitted by BROWNING, STEPHEN on Oct 18, 2021. KO4K has 4 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- --- ....- -.-
CW Weight: 30 units(Light (fast to send))
Voice Phonetics
Kilo Oscar Four Kilo
Readability: 8.5/10(High readability)
License History
- License RenewedMar 12, 2026
- License RenewedMar 1, 2016
- License RenewedMay 16, 2006
- FRN Association Email SentMay 16, 2006
Vanity Application Activity
Competing applications filed with the FCC for this callsign.