Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9WFR callsign genealogy
Currently held by Ferrari, William S
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 K9WFR's current licensee, walking backwards.
- Ferrari, William SCAgranted 2017-07-28cancelled 2018-06-16
Successor callsigns
Callsigns held now by people who previously held K9WFR.
- Forseth, Jeffrey DMNgranted 2004-09-21cancelled 2005-10-13
All historical holders
Every license row we've seen with the callsign K9WFR, oldest first.
- FORSETH, JEFFREY D MN2004-09-21 → cancelled 2005-03-01
- Ferrari, William S CA2018-06-16 active