Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0EM callsign genealogy
Currently held by Diller, Aaron L
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 AC0EM's current licensee, walking backwards.
- Mather, Eric GCOgranted 2008-08-11cancelled 2008-09-12
Successor callsigns
Callsigns held now by people who previously held AC0EM.
- Diller, Aaron LKSgranted 2026-03-13
All historical holders
Every license row we've seen with the callsign AC0EM, oldest first.
- Diller, Aaron L KS2002-07-19 → cancelled 2006-05-31
- Mather, Eric G CO2018-06-21 active