Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4JZ callsign genealogy
Currently held by KEMPPAINEN, JON A
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 N4JZ's current licensee, walking backwards.
- KEMPPAINEN, JON ATXgranted 2018-06-25cancelled 2022-06-24
Successor callsigns
Callsigns held now by people who previously held N4JZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4JZ, oldest first.
- KEMPPAINEN, DALE J NC2012-03-07 → cancelled 2020-07-10
- KEMPPAINEN, JON A TX2022-06-24 active