Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4HJK callsign genealogy
Currently held by Kallio III, Harold J
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 K4HJK's current licensee, walking backwards.
- Kallio III, Harold JVAgranted 2018-01-16cancelled 2018-02-03
Successor callsigns
Callsigns held now by people who previously held K4HJK.
No current licensee on record previously held this callsign.