Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K6WTA callsign genealogy
Currently held by Osterstock, Mark D
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 K6WTA's current licensee, walking backwards.
- Osterstock, Mark DCAgranted 2019-06-10cancelled 2020-02-11
Successor callsigns
Callsigns held now by people who previously held K6WTA.
No current licensee on record previously held this callsign.