Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9GEO callsign genealogy
Currently held by KLEIN, THOMAS L
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 K9GEO's current licensee, walking backwards.
- Klein, Thomas LILgranted 2016-06-08cancelled 2016-07-06
Successor callsigns
Callsigns held now by people who previously held K9GEO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9GEO, oldest first.
- Stuart, George S OR2000-08-01 → cancelled 2012-08-02
- KLEIN, THOMAS L IL2026-05-19 active