Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6SDR callsign genealogy
Currently held by Horie, Masaharu
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 W6SDR's current licensee, walking backwards.
- Horie, MasaharuCAgranted 2023-05-02cancelled 2024-03-22
Successor callsigns
Callsigns held now by people who previously held W6SDR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6SDR, oldest first.
- Rosen, Daniel CA2012-01-14 → cancelled 2024-01-17
- Horie, Masaharu CA2024-03-22 active