Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KX4MC callsign genealogy
Currently held by Harper, Malcolm C
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 KX4MC's current licensee, walking backwards.
- Harper, Malcolm CCOgranted 2022-03-17cancelled 2022-05-21
Successor callsigns
Callsigns held now by people who previously held KX4MC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KX4MC, oldest first.
- Harper, Malcolm L GA2018-07-06 → cancelled 2020-06-01
- Harper, Malcolm C CO2022-05-21 active