Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9AT callsign genealogy
Currently held by HOLMGREN, DAVID 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 K9AT's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K9AT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9AT, oldest first.
- CHOISSER, BILL CA2007-02-14 → cancelled 2017-04-13
- HOLMGREN, DAVID J IL2019-05-03 active