Confidence: Medium · Source: FCC ULS · As of 2026-09-14
NA9J callsign genealogy
Currently held by Kotlarik, John J
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 NA9J's current licensee, walking backwards.
- Kotlarik, John JWIgranted 2008-01-22cancelled 2008-10-17
Successor callsigns
Callsigns held now by people who previously held NA9J.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign NA9J, oldest first.
- COOK, JACK R IL1993-07-27 → cancelled 2005-07-28
- Kotlarik, John J FL2018-07-24 active