Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4RBR callsign genealogy
Currently held by Yoon, Wang Hyun
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 K4RBR's current licensee, walking backwards.
- Yoon, Wang HyunNJgranted 2015-07-09cancelled 2015-08-04
Successor callsigns
Callsigns held now by people who previously held K4RBR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4RBR, oldest first.
- WARD, F NORMAN FL2003-02-25 → cancelled 2015-05-27
- Yoon, Wang Hyun NJ2015-08-04 active