Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4ZRU callsign genealogy
Currently held by Hoffman, William 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 KO4ZRU'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 KO4ZRU.
- Hoffman, William RALgranted 2022-05-03