Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4FWR callsign genealogy
Currently held by Ryba, Frank W
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 K4FWR's current licensee, walking backwards.
- Ryba, Frank WFLgranted 2012-01-09cancelled 2012-01-31
Successor callsigns
Callsigns held now by people who previously held K4FWR.
- BUTLER, ROBERT LGAgranted 2016-08-09