Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KU4GS callsign genealogy
Currently held by SUNDERBRUCH, MICHAEL 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 KU4GS's current licensee, walking backwards.
- KE4RDCno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held KU4GS.
- SUNDERBRUCH, MICHAEL RFLgranted 2022-02-10