Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4YZB callsign genealogy
Currently held by Greiner, Jason 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 KO4YZB's current licensee, walking backwards.
- Greiner, Jason DTNgranted 2022-04-12
Successor callsigns
Callsigns held now by people who previously held KO4YZB.
- Greiner, Jason DTNgranted 2022-04-12