K4PUP
Active1x3District 4
Competitive callsign — 5 applications filed with the FCC.
License HolderMayer, Donald
License ClassGeneral
Min. Class RequiredGeneral
LocationSEQUIM, WA
Grant DateJan 9, 2026
Expiration DateJan 9, 2036
K4PUP is a highly sought-after 1x3 format amateur radio callsign. The license is currently held by Mayer, Donald in SEQUIM, WA. This callsign has attracted significant interest in the amateur radio community, with 5 vanity applications filed with the FCC. The most recent was submitted by Mayer, Donald on Dec 22, 2025. K4PUP has 7 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- ....- .--. ..- .--.
CW Weight: 35 units(Moderate)
Voice Phonetics
Kilo Four Papa Uniform Papa
Readability: 7.5/10(High readability)
License History
- License IssuedJan 9, 2026
- Vanity Callsign GrantedJan 9, 2026
- License ExpiredApr 10, 2025
- Vanity Callsign GrantedApr 9, 2013
- License IssuedApr 9, 2013
- License ExpiredMar 4, 2010
- Authorization PrintedJan 16, 2009
Vanity Application Activity
Competing applications filed with the FCC for this callsign.