Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K2JA callsign genealogy
Currently held by IONOSPHERIC RESEARCH GROUP AMATEUR RAD CLB
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 K2JA's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K2JA.
- W2GAactiveIONOSPHERIC RESEARCH GROUP AMATEUR RAD CLBCAgranted 2015-04-21
All historical holders
Every license row we've seen with the callsign K2JA, oldest first.
- IONOSPHERIC RESEARCH GROUP AMATEUR RAD CLB CA1998-12-09 → cancelled 2003-04-22
- Nishimura, Yoshiro FL2025-04-08 active