Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC0FBI callsign genealogy
Currently held by PETERSON, WILLIAM 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 KC0FBI's current licensee, walking backwards.
- Guenther, JacobMOgranted 2020-01-10cancelled 2020-02-04
Successor callsigns
Callsigns held now by people who previously held KC0FBI.
- Guenther, JacobTXgranted 2020-02-28
All historical holders
Every license row we've seen with the callsign KC0FBI, oldest first.
- PETERSON, WILLIAM C MN1999-06-28 → cancelled 2011-02-25
- Guenther, Jacob MO2020-02-04 → cancelled 2020-02-28