Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC4M callsign genealogy
Currently held by WALLEN, JONATHAN C
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 AC4M's current licensee, walking backwards.
- WALLEN, JONATHAN CTNgranted 2006-02-02cancelled 2009-05-05
Successor callsigns
Callsigns held now by people who previously held AC4M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC4M, oldest first.
- HORTON, RICHARD R FL1997-12-17 → cancelled 2007-04-14
- WALLEN, JONATHAN C TN2019-04-11 active