Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0OA callsign genealogy
Currently held by PFOHL, TIM S
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K0OA's current licensee, walking backwards.
- Nikaido, ShinsukeWAgranted 2015-03-31cancelled 2015-07-07
Successor callsigns
Callsigns held now by people who previously held K0OA.
- PFOHL, TIM SMOgranted 2023-11-21
All historical holders
Every license row we've seen with the callsign K0OA, oldest first.
- PFOHL, TIM S MO2009-04-14 → cancelled 2013-06-18
- Nikaido, Shinsuke WA2015-07-07 active