Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4TVS callsign genealogy
Currently held by Steffen, Matthew D
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 KO4TVS's current licensee, walking backwards.
- Steffen, Matt DFLgranted 2021-02-04cancelled 2021-03-30
Successor callsigns
Callsigns held now by people who previously held KO4TVS.
No current licensee on record previously held this callsign.