Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WB9NOY callsign genealogy
Currently held by Brethorst, William L
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 WB9NOY's current licensee, walking backwards.
- Brethorst, William LWIgranted 2007-04-12cancelled 2007-05-01
Successor callsigns
Callsigns held now by people who previously held WB9NOY.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WB9NOY, oldest first.
- BRETHORST, WILLIAM L WI1988-03-29 → cancelled 2000-03-30
- Brethorst, William L WI2017-02-11 active