Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KN4JRF callsign genealogy
Currently held by Schoepke, Mark C
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 KN4JRF's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KN4JRF.
- Schoepke, Mark CVAgranted 2019-12-31
All historical holders
Every license row we've seen with the callsign KN4JRF, oldest first.
- Schoepke, Mark C VA2018-02-13 → cancelled 2019-12-31
- LEONARD JR, JOHN B IL2020-07-17 active