Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4JKH callsign genealogy
Currently held by Helbling, John Kearns
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 K4JKH's current licensee, walking backwards.
- Helbling, John KNCgranted 2016-12-09cancelled 2017-03-28
Successor callsigns
Callsigns held now by people who previously held K4JKH.
No current licensee on record previously held this callsign.