Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KY4SU callsign genealogy
Currently held by Gerlinger Jr, Louis
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 KY4SU'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 KY4SU.
- Gerlinger Jr, LouisFLgranted 2026-06-19