Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4YRW callsign genealogy
Currently held by Du, Haoze
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 KO4YRW'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 KO4YRW.
- Du, HaozeNCgranted 2022-03-17cancelled 2022-05-03