Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4ZPF callsign genealogy
Currently held by KROSNER, STEPHEN 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 K4ZPF's current licensee, walking backwards.
- Estridge, Jess PKYgranted 2025-03-04cancelled 2025-04-12
Successor callsigns
Callsigns held now by people who previously held K4ZPF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4ZPF, oldest first.
- KROSNER, STEPHEN P GA2010-03-09 → cancelled 2022-03-10
- Estridge, Jess P KY2025-04-12 active