Confidence: Medium · Source: FCC ULS · As of 2026-11-02
K4MGM callsign genealogy
Currently held by MASSEY, M MADELIN 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 K4MGM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K4MGM.
- COLD, SHERMAN JUTgranted 2025-01-22
All historical holders
Every license row we've seen with the callsign K4MGM, oldest first.
- MASSEY, M MADELIN C FL2006-04-04 → cancelled 2018-04-05
- COLD, SHERMAN J UT2019-11-08 → cancelled 2025-01-22