Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4JMW callsign genealogy
Currently held by CORWIN JR, JOHN L
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 KF4JMW's current licensee, walking backwards.
- Corwin, Erwin TWVgranted 2024-12-11cancelled 2024-12-31
Successor callsigns
Callsigns held now by people who previously held KF4JMW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF4JMW, oldest first.
- CORWIN JR, JOHN L OR1999-05-04 → cancelled 2008-05-10
- Corwin, Erwin T WV2024-12-31 active