Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB7BT callsign genealogy
Currently held by Shibuya, Shunsuke
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 AB7BT's current licensee, walking backwards.
- Shibuya, ShunsukeORgranted 2016-06-23cancelled 2016-08-16
Successor callsigns
Callsigns held now by people who previously held AB7BT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB7BT, oldest first.
- MADDOX, LAWRENCE L WA2004-01-02 → cancelled 2016-03-30
- Shibuya, Shunsuke OR2016-08-16 active