Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K8TSU callsign genealogy
Currently held by Tanda, Katsuhiro
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 K8TSU's current licensee, walking backwards.
- Tanda, KatsuhiroOHgranted 2024-11-14cancelled 2025-01-22
Successor callsigns
Callsigns held now by people who previously held K8TSU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K8TSU, oldest first.
- OSTER, GORDON W MI1999-02-26 → cancelled 2011-03-01
- Tanda, Katsuhiro OH2025-01-22 active