Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KD0SYZ callsign genealogy
Currently held by OYER, JOHNATHON M
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 KD0SYZ's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KD0SYZ.
- OYER, JOHNATHON MKSgranted 2023-01-20