Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GDZ callsign genealogy
Currently held by Williamson, John P
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 K4GDZ's current licensee, walking backwards.
- WILLIAMSON, JOHN PVAgranted 2006-04-18cancelled 2010-02-06
Successor callsigns
Callsigns held now by people who previously held K4GDZ.
- WILLIAMSON, JOHN PVAgranted 2006-04-18cancelled 2010-02-06
All historical holders
Every license row we've seen with the callsign K4GDZ, oldest first.
- Williamson, John P VA2005-12-29 → cancelled 2006-04-18
- WILLIAMSON, JOHN P VA2020-01-24 active