K4SDX
Active1x3District 4
Competitive callsign — 6 applications filed with the FCC.
License HolderSullivan, Daniel E
License ClassAmateur Extra
Min. Class RequiredGeneral
LocationHOLLADAY, TN
Grant DateJan 1, 2026
Expiration DateFeb 7, 2036
K4SDX is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Sullivan, Daniel E in HOLLADAY, TN. 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 Smith, Samuel D on Apr 10, 2006. K4SDX has 10 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- ... -.. -..-
CW Weight: 30 units(Light (fast to send))
Voice Phonetics
Kilo Four Sierra Delta X-ray
Readability: 7.5/10(High readability)
License History
- License RenewedJan 1, 2026
- Administrative Update AppliedFeb 6, 2018
- Administrative Update AppliedFeb 1, 2018
- Administrative Update AppliedJan 23, 2018
- License RenewedFeb 2, 2016
- Administrative Update AppliedOct 13, 2012
- License ModifiedApr 7, 2009
- License ModifiedOct 2, 2008
- License IssuedFeb 7, 2006
- Vanity Callsign GrantedFeb 7, 2006
Vanity Application Activity
Competing applications filed with the FCC for this callsign.