Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KZ3D callsign genealogy
Currently held by CLARK, CHARLES M
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 KZ3D's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KZ3D.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KZ3D, oldest first.
- CLARK, CHARLES M MD2005-09-23 → cancelled 2017-11-29
- Harp, R Jeffrey PA2017-12-19 active