Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9YBZ callsign genealogy
Currently held by Wan, Yuhui
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 W9YBZ's current licensee, walking backwards.
- Wan, YuhuiINgranted 2015-02-26cancelled 2015-05-23
Successor callsigns
Callsigns held now by people who previously held W9YBZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9YBZ, oldest first.
- YAREMA SR, JOHN A IL1997-02-03 → cancelled 2009-02-04
- Wan, Yuhui IN2025-04-08 active