Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1FF callsign genealogy
Currently held by SEFRANEK, 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 AB1FF's current licensee, walking backwards.
- SEFRANEK, THOMAS CMAgranted 2008-02-13cancelled 2017-08-11
Successor callsigns
Callsigns held now by people who previously held AB1FF.
- Pellant, Jon RFLgranted 2016-06-16
All historical holders
Every license row we've seen with the callsign AB1FF, oldest first.
- Pellant, Jon R MA2004-08-19 → cancelled 2006-09-12
- SEFRANEK, THOMAS C MA2017-08-11 active