Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4GMX callsign genealogy
Currently held by Herrington, Donald K
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 K4GMX's current licensee, walking backwards.
- Herrington, Donald KKYgranted 2021-05-28cancelled 2021-06-25
Successor callsigns
Callsigns held now by people who previously held K4GMX.
- ZDUNCZYK, RICHARD JFLgranted 1998-11-12cancelled 2010-11-13
All historical holders
Every license row we've seen with the callsign K4GMX, oldest first.
- Herrington, Donald K KY2021-06-25 active
- —— → cancelled 1998-11-12