Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6MBZ callsign genealogy
Currently held by Nussdorfer, David A
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 K6MBZ's current licensee, walking backwards.
- Spears, DarrellCAgranted 2021-08-25cancelled 2021-09-14
Successor callsigns
Callsigns held now by people who previously held K6MBZ.
- Nussdorfer, David ANMgranted 2017-10-20
All historical holders
Every license row we've seen with the callsign K6MBZ, oldest first.
- BAYSIDE AMATEUR RADIO FRATERNITY REMOTE 10 CA1999-03-31 → cancelled 2001-06-13
- Nussdorfer, David A CA2017-09-30 → cancelled 2017-10-20
- Spears, Darrell CA2021-09-14 active