Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KJ4MHW callsign genealogy
Currently held by MATHIESON, MARK S
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 KJ4MHW's current licensee, walking backwards.
- MATHIESON, MARK SFLgranted 2008-10-03cancelled 2009-05-21
Successor callsigns
Callsigns held now by people who previously held KJ4MHW.
No current licensee on record previously held this callsign.