Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KZ4ZC callsign genealogy
Currently held by Sheffield, Richard
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 KZ4ZC's current licensee, walking backwards.
- Sheffield, RichardFLgranted 2017-01-04cancelled 2026-01-20
Successor callsigns
Callsigns held now by people who previously held KZ4ZC.
No current licensee on record previously held this callsign.