Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC4TD callsign genealogy
Currently held by Dwyer, Timothy 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 AC4TD's current licensee, walking backwards.
- Dwyer, Timothy JFLgranted 2015-09-02cancelled 2025-05-16
Successor callsigns
Callsigns held now by people who previously held AC4TD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AC4TD, oldest first.
- BRUNNER, WILLIAM L DE2004-02-26 → cancelled 2016-05-25
- Dwyer, Timothy J FL2025-05-16 active