Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W6SBW callsign genealogy
Currently held by SHIMOMURA, HIROYUKI
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 W6SBW's current licensee, walking backwards.
- SHIMOMURA, HIROYUKIORgranted 2012-03-20cancelled 2013-02-12
Successor callsigns
Callsigns held now by people who previously held W6SBW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6SBW, oldest first.
- COOK, ROBERT W CA1996-02-05 → cancelled 2008-02-06
- SHIMOMURA, HIROYUKI OR2013-02-12 → cancelled 2025-02-13