Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4SM callsign genealogy
Currently held by Brown, William 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 AI4SM's current licensee, walking backwards.
- Brown, William JFLgranted 1999-01-25cancelled 2006-11-14
Successor callsigns
Callsigns held now by people who previously held AI4SM.
No current licensee on record previously held this callsign.