Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KZ4FX callsign genealogy
Currently held by Williams, William R
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 KZ4FX's current licensee, walking backwards.
- Williams, William RTNgranted 2024-03-16cancelled 2024-04-09
Successor callsigns
Callsigns held now by people who previously held KZ4FX.
No current licensee on record previously held this callsign.