Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4UIB callsign genealogy
Currently held by SCHAFER, FREDERICK R
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 KK4UIB'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 KK4UIB.
- SCHAFER, FREDERICK RSCgranted 2023-11-15cancelled 2026-01-21