Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MDJ callsign genealogy
Currently held by Joiner, Mark 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 K4MDJ's current licensee, walking backwards.
- Joiner, Mark DALgranted 2013-01-16cancelled 2013-02-20
Successor callsigns
Callsigns held now by people who previously held K4MDJ.
- CLIFT, CHARLES GSCgranted 2000-02-22cancelled 2005-07-29
All historical holders
Every license row we've seen with the callsign K4MDJ, oldest first.
- CLIFT, CHARLES G SC1999-06-08 → cancelled 2000-02-22
- Joiner, Mark D AL2023-05-04 active