Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NW9K callsign genealogy
Currently held by DROPSKI, WILLIAM J
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 NW9K's current licensee, walking backwards.
- Zhao, YanpingCAgranted 2019-01-30cancelled 2019-11-02
Successor callsigns
Callsigns held now by people who previously held NW9K.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NW9K, oldest first.
- DROPSKI, WILLIAM J IL2007-07-12 → cancelled 2019-10-03
- Zhao, Yanping CA2019-11-02 active