Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K3RZ callsign genealogy
Currently held by McSwain, Jack 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 K3RZ's current licensee, walking backwards.
- McSwain, Jack ROKgranted 2014-04-08cancelled 2016-02-06
Successor callsigns
Callsigns held now by people who previously held K3RZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K3RZ, oldest first.
- ZOPPETTI, ROBERT L PA2004-01-08 → cancelled 2016-01-19
- McSwain, Jack R OK2025-11-26 active