Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD4FM callsign genealogy
Currently held by Mahler, Fred W
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 AD4FM's current licensee, walking backwards.
- Mahler, Fred WTNgranted 2023-07-15cancelled 2024-02-10
Successor callsigns
Callsigns held now by people who previously held AD4FM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AD4FM, oldest first.
- GRIFFITH, WILLIAM M TN2003-03-12 → cancelled 2015-06-02
- Mahler, Fred W TN2024-02-10 active