Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6ZWZ callsign genealogy
Currently held by OTOW, SEIICHI
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 K6ZWZ's current licensee, walking backwards.
- Von Schalscha, Michael PCAgranted 2019-11-19cancelled 2019-12-20
Successor callsigns
Callsigns held now by people who previously held K6ZWZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6ZWZ, oldest first.
- OTOW, SEIICHI CA1988-04-19 → cancelled 2000-04-20
- HAMILTON MR, JACK F CA2007-07-27 → cancelled 2019-07-30
- Von Schalscha, Michael P CA2019-12-20 active