Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9MKZ callsign genealogy
Currently held by DUBELBEIS, ROBERT E
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 K9MKZ's current licensee, walking backwards.
- Kennedy, John GILgranted 2025-05-06cancelled 2026-03-24
Successor callsigns
Callsigns held now by people who previously held K9MKZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9MKZ, oldest first.
- DUBELBEIS, ROBERT E IL2021-06-14 → cancelled 2024-04-03
- Kennedy, John G IL2026-03-24 active