Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD9MH callsign genealogy
Currently held by AARON, JOHN EARL
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 KD9MH's current licensee, walking backwards.
- Heiser, Mark RINgranted 2014-03-13cancelled 2014-07-12
Successor callsigns
Callsigns held now by people who previously held KD9MH.
- Heiser, Mark RINgranted 2016-12-24
All historical holders
Every license row we've seen with the callsign KD9MH, oldest first.
- AARON, JOHN EARL IN1995-01-21 → cancelled 2007-01-23
- Heiser, Mark R IN2014-07-12 → cancelled 2016-12-24