WP4O
Active2x1District 4
Competitive callsign — 13 applications filed with the FCC.
License HolderOTERO, PEDRO J
License ClassAmateur Extra
Min. Class RequiredAmateur Extra
LocationBAYAMON, PR
Grant DateFeb 21, 2026
Expiration DateMay 13, 2036
WP4O is a highly sought-after 2x1 format amateur radio callsign. The license is currently held by OTERO, PEDRO J in BAYAMON, PR. This callsign has attracted significant interest in the amateur radio community, with 13 vanity applications filed with the FCC. The most recent was submitted by Rivera, Osvaldo on Mar 22, 2023. WP4O has 14 recorded FCC license history events.
CW & Voice Analysis
Morse Code
.-- .--. ....- ---
CW Weight: 31 units(Moderate)
Voice Phonetics
Whiskey Papa Four Oscar
Readability: 8.5/10(High readability)
License History
- License RenewedFeb 21, 2026
- Administrative Update AppliedAug 13, 2016
- Administrative Update AppliedJun 4, 2016
- Vanity Callsign GrantedMay 13, 2016
- License IssuedMay 13, 2016
- License CanceledApr 22, 2014
- Administrative Update AppliedSep 13, 2012
- Administrative Update AppliedSep 12, 2012
- Vanity Callsign GrantedSep 11, 2012
- License IssuedSep 11, 2012
- License CanceledAug 7, 2012
- Administrative Update Applied
Vanity Application Activity
Competing applications filed with the FCC for this callsign.