Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4HSY callsign genealogy
Currently held by Yim, Hyunhak
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 W4HSY's current licensee, walking backwards.
- Yim, HyunhakGAgranted 2022-01-24cancelled 2022-02-11
Successor callsigns
Callsigns held now by people who previously held W4HSY.
No current licensee on record previously held this callsign.