Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4UB callsign genealogy
Currently held by Topolski, James 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 AI4UB's current licensee, walking backwards.
- Topolski, James MVAgranted 2000-04-01cancelled 2007-03-02
Successor callsigns
Callsigns held now by people who previously held AI4UB.
No current licensee on record previously held this callsign.