Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4RJF callsign genealogy
Currently held by Foisy Jr., Roger J
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 K4RJF's current licensee, walking backwards.
- Foisy Jr., Roger JFLgranted 2023-06-24cancelled 2023-07-25
Successor callsigns
Callsigns held now by people who previously held K4RJF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4RJF, oldest first.
- Ahlhaus Sr., Paul J KY2008-11-05 → cancelled 2020-12-05
- Foisy Jr., Roger J FL2023-07-25 active