Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4X callsign genealogy
Currently held by JOHNSTON, HERBERT 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 KC4X's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KC4X.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4X, oldest first.
- JOHNSTON, HERBERT R ID2008-06-30 → cancelled 2010-11-25
- SHOAF, DAVID B NC2022-10-13 active