Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF9O callsign genealogy
Currently held by Ferrall, Brian R
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 KF9O's current licensee, walking backwards.
- Ferrall, Brian RGAgranted 2017-01-20cancelled 2017-12-01
Successor callsigns
Callsigns held now by people who previously held KF9O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF9O, oldest first.
- HARRINGTON, DONALD D FL2005-11-09 → cancelled 2017-11-09
- Ferrall, Brian R GA2017-12-01 active