Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD9YZ callsign genealogy
Currently held by Schiess, Mark
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 AD9YZ's current licensee, walking backwards.
- Schiess, MarkINgranted 2023-11-22cancelled 2023-12-12
Successor callsigns
Callsigns held now by people who previously held AD9YZ.
No current licensee on record previously held this callsign.