Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KF4YUN callsign genealogy
Currently held by RUFFALO, JOHN J
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 KF4YUN's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KF4YUN.
- RUFFALO, JOHN JSCgranted 2019-02-16