Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD9M callsign genealogy
Currently held by MATHIS, DAVID K
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 WD9M's current licensee, walking backwards.
- MATHIS, DAVID KILgranted 2012-02-28cancelled 2020-06-30
- KB9CHVno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held WD9M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD9M, oldest first.
- CLARK, LARRY D IN2008-04-26 → cancelled 2020-06-10
- MATHIS, DAVID K IL2020-06-30 active