Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC9MM callsign genealogy
Currently held by Magruder, Michael
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 KC9MM's current licensee, walking backwards.
- MAGRUDER, MICHAEL DINgranted 2012-09-25cancelled 2022-04-01
Successor callsigns
Callsigns held now by people who previously held KC9MM.
- ERICKSON, GARY RWIgranted 2020-03-30
All historical holders
Every license row we've seen with the callsign KC9MM, oldest first.
- ERICKSON, GARY R WI1996-10-08 → cancelled 2000-06-20
- Magruder, Michael IN2022-04-01 active