Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9OBI callsign genealogy
Currently held by Zinn, Jeffrey S
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 K9OBI's current licensee, walking backwards.
- Zinn, Jeffrey SILgranted 2022-10-26cancelled 2023-05-12
Successor callsigns
Callsigns held now by people who previously held K9OBI.
No current licensee on record previously held this callsign.