KO1O
Active2x1District 1
Competitive callsign — 1 application filed with the FCC.
License HolderVETTERLING, WILLIAM T
License ClassAmateur Extra
Min. Class RequiredAmateur Extra
LocationLEXINGTON, MA
Grant DateJun 6, 2025
Expiration DateJun 1, 2035
KO1O is a highly sought-after 2x1 format amateur radio callsign. The license is currently held by VETTERLING, WILLIAM T in LEXINGTON, MA. This callsign has attracted significant interest in the amateur radio community, with 1 vanity application filed with the FCC. The most recent was submitted by Kaplan, Jon on May 16, 2025. KO1O has 5 recorded FCC license history events.
CW & Voice Analysis
Morse Code
-.- --- .---- ---
CW Weight: 38 units(Moderate)
Voice Phonetics
Kilo Oscar One Oscar
Readability: 8.5/10(High readability)
License History
- Administrative Update AppliedJun 9, 2025
- License RenewedJun 6, 2025
- License RenewedMar 12, 2015
- Tax ID (TIN) AddedMar 22, 2005
- License RenewedMar 22, 2005
Vanity Application Activity
Competing applications filed with the FCC for this callsign.
- Kaplan, JonFiled May 16, 2025DismissedFCC ↗