Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD7MM callsign genealogy
Currently held by Mueller, Michael J
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 KD7MM's current licensee, walking backwards.
- Mueller, Michael JORgranted 2014-12-30cancelled 2018-11-09
Successor callsigns
Callsigns held now by people who previously held KD7MM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD7MM, oldest first.
- HESSMAN, ROBERT D OR1994-01-18 → cancelled 2006-01-19
- Mueller, Michael J OR2018-11-09 active