Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD6DEF callsign genealogy
Currently held by Heath, Geoff A
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 KD6DEF's current licensee, walking backwards.
- Heath, Geoff ACAgranted 2014-12-18cancelled 2015-01-09
Successor callsigns
Callsigns held now by people who previously held KD6DEF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD6DEF, oldest first.
- KIM, SUNG SOO CA1991-11-19 → cancelled 2003-11-20
- Heath, Geoff A CA2015-01-09 active