Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4ACJ callsign genealogy
Currently held by Mullinax, Christopher D
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 K4ACJ's current licensee, walking backwards.
- Mullinax, Chris DSCgranted 2024-04-05cancelled 2024-05-25
Successor callsigns
Callsigns held now by people who previously held K4ACJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4ACJ, oldest first.
- COHEN, SAUL A FL2007-08-14 → cancelled 2019-11-05
- Mullinax, Christopher D SC2024-05-25 active