Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9KST callsign genealogy
Currently held by Gronholm, Gregory T
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 K9KST's current licensee, walking backwards.
- Gronholm, Gregory TGAgranted 2019-07-11cancelled 2019-07-30
Successor callsigns
Callsigns held now by people who previously held K9KST.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9KST, oldest first.
- RANGE, JOHN F IL1999-01-05 → cancelled 2011-01-06
- Gronholm, Gregory T GA2019-07-30 active