Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AF4TH callsign genealogy
Currently held by VIOLA, MICHAEL F
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 AF4TH's current licensee, walking backwards.
- VIOLA, MICHAEL FFLgranted 1992-12-29cancelled 2000-05-11
Successor callsigns
Callsigns held now by people who previously held AF4TH.
- VIOLA, MICHAEL FNCgranted 2020-05-15