Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4RL callsign genealogy
Currently held by Treadway Jr, William G
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 AI4RL's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AI4RL.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AI4RL, oldest first.
- Treadway Jr, William G TN2011-05-09 → cancelled 2023-08-01
- ROSEN, IDO M CA2024-03-02 active