Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0SFI callsign genealogy
Currently held by Branham, Bobby
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 K0SFI's current licensee, walking backwards.
- Branham, BobbyCOgranted 2021-03-09cancelled 2021-04-02
Successor callsigns
Callsigns held now by people who previously held K0SFI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0SFI, oldest first.
- BERGSIEKER, LLOYD R MO1994-10-05 → cancelled 2006-10-06
- Branham, Bobby CO2021-04-02 active