Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9MPM callsign genealogy
Currently held by Maier, Michael P
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 K9MPM's current licensee, walking backwards.
- Maier, Michael PWIgranted 2017-07-10cancelled 2018-06-29
Successor callsigns
Callsigns held now by people who previously held K9MPM.
- Martinson, Dean RWIgranted 2018-09-12
All historical holders
Every license row we've seen with the callsign K9MPM, oldest first.
- Martinson Mr, Dean R WI2008-02-26 → cancelled 2008-11-18
- Maier, Michael P WI2018-06-29 active