Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1FO callsign genealogy
Currently held by Tonelli, Thomas C
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 AB1FO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AB1FO.
- Tonelli, Thomas CMAgranted 2016-02-25cancelled 2022-04-26
All historical holders
Every license row we've seen with the callsign AB1FO, oldest first.
- Tonelli, Thomas C MA2005-08-12 → cancelled 2006-01-10
- Tonelli, Thomas C MA2022-04-26 active