Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4O callsign genealogy
Currently held by FRAZIER, CLARENCE 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 AI4O's current licensee, walking backwards.
- FRAZIER, CLARENCE Mcancelled 1999-03-31
Successor callsigns
Callsigns held now by people who previously held AI4O.
No current licensee on record previously held this callsign.