Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC9X callsign genealogy
Currently held by MATHIS, GUY R
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 AC9X's current licensee, walking backwards.
- Ward, Aaron JWIgranted 2017-11-28cancelled 2022-12-09
Successor callsigns
Callsigns held now by people who previously held AC9X.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC9X, oldest first.
- MALMQUIST, ROBERT W IL1988-07-12 → cancelled 2000-07-13
- MATHIS, GUY R IN2011-01-11 → cancelled 2022-11-18
- Ward, Aaron J WI2022-12-09 active