Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4HDM callsign genealogy
Currently held by TRENT, GRANVILLE 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 K4HDM's current licensee, walking backwards.
- Hamersly, Mark DFLgranted 2017-12-12cancelled 2017-12-30
Successor callsigns
Callsigns held now by people who previously held K4HDM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4HDM, oldest first.
- TRENT, GRANVILLE H NC1995-07-11 → cancelled 2007-07-12
- Hamersly, Mark D FL2017-12-30 active