Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4FOJ callsign genealogy
Currently held by HEISNER SR, JAMES H
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 K4FOJ's current licensee, walking backwards.
- HEISNER SR, JAMES HFLgranted 2002-03-14cancelled 2003-05-06
Successor callsigns
Callsigns held now by people who previously held K4FOJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4FOJ, oldest first.
- HEISNER, CHARLES H FL1996-08-09 → cancelled 2002-10-06
- HEISNER SR, JAMES H FL2023-09-01 active