Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9OK callsign genealogy
Currently held by HARTMAN, THOMAS 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 K9OK's current licensee, walking backwards.
- Otto, GlennILgranted 2019-01-30cancelled 2020-05-22
Successor callsigns
Callsigns held now by people who previously held K9OK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9OK, oldest first.
- HARTMAN, THOMAS D FL2008-10-17 → cancelled 2018-05-02
- Otto, Glenn IL2020-05-22 active