Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA4TO callsign genealogy
Currently held by CARPENTER, JOHN M
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 AA4TO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AA4TO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AA4TO, oldest first.
- HOFFMAN, DAVID C FL1996-02-15 → cancelled 2008-02-16
- CARPENTER, JOHN M TX2022-09-03 active