Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9FXL callsign genealogy
Currently held by Gruber, Stefan
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 K9FXL's current licensee, walking backwards.
- Gruber, StefanCAgranted 2017-05-10cancelled 2017-07-18
Successor callsigns
Callsigns held now by people who previously held K9FXL.
No current licensee on record previously held this callsign.