Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9PMA callsign genealogy
Currently held by Mueller-Stosch, Johannes
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 K9PMA's current licensee, walking backwards.
- Alt, Philip MINgranted 2017-07-10cancelled 2019-02-09
Successor callsigns
Callsigns held now by people who previously held K9PMA.
- Stosch, Johannes MCAgranted 2016-11-15
All historical holders
Every license row we've seen with the callsign K9PMA, oldest first.
- Mueller-Stosch, Johannes CA2015-07-14 → cancelled 2016-11-15
- Alt, Philip M IN2019-02-09 active