K4UDP
Available1x3District 4
Competitive callsign — 3 applications filed with the FCC.
License HolderTreftz, Kristjan K
License ClassGeneral
Min. Class RequiredGeneral
LocationHernando, FL
Grant DateOct 5, 2012
Expiration DateOct 5, 2022
Cancellation DateOct 8, 2024
Available for ApplicationsOct 6, 2024
K4UDP is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Treftz, Kristjan K in Hernando, FL. This callsign has attracted significant interest in the amateur radio community, with 3 vanity applications filed with the FCC. The most recent was submitted by Wood, Patrick L on Dec 15, 2025. K4UDP has 3 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- ..- -.. .--.
CW Weight: 32 units(Moderate)
Voice Phonetics
Kilo Four Uniform Delta Papa
Readability: 7.5/10(High readability)
This callsign is available now
Requires General license or higher to apply for this callsign format (1x3).
License History
- License ExpiredOct 8, 2024
- License IssuedOct 5, 2012
- Vanity Callsign GrantedOct 5, 2012
Vanity Application Activity
Competing applications filed with the FCC for this callsign.