Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4HFJ callsign genealogy
Currently held by Thompson, Michael D
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 KM4HFJ's current licensee, walking backwards.
- Thompson, Michael DFLgranted 2014-11-12cancelled 2015-01-15
Successor callsigns
Callsigns held now by people who previously held KM4HFJ.
No current licensee on record previously held this callsign.