Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4FCZ callsign genealogy
Currently held by DeWitt, Mark A
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 KO4FCZ'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 KO4FCZ.
- DeWitt, Mark ATNgranted 2020-07-25