Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0JPN callsign genealogy
Currently held by SIMMS JR, W FRANK
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 K0JPN's current licensee, walking backwards.
- Kumita, YasuhiroCAgranted 2025-12-10cancelled 2026-03-27
Successor callsigns
Callsigns held now by people who previously held K0JPN.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0JPN, oldest first.
- SIMMS JR, W FRANK FL1991-04-23 → cancelled 2003-04-24
- Kumita, Yasuhiro CA2026-03-27 active