Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KY4OK 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 KY4OK's current licensee, walking backwards.
- Du, HaozeNCgranted 2022-03-17cancelled 2022-04-07
Successor callsigns
Callsigns held now by people who previously held KY4OK.
- Du, HaozeNCgranted 2022-05-03