Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4OJ callsign genealogy
Currently held by Florida Contest Group
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 K4OJ's current licensee, walking backwards.
- KI4IJPcancelledFlorida Contest GroupFLgranted 2005-01-14cancelled 2005-02-12
Successor callsigns
Callsigns held now by people who previously held K4OJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4OJ, oldest first.
- WHITE, JAMES A FL1996-11-04 → cancelled 2004-02-12
- Florida Contest Group FL2025-01-22 active