Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC9AJ callsign genealogy
Currently held by DENK SR, FRANK W
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 KC9AJ's current licensee, walking backwards.
- Simms, Aaron JMNgranted 2022-05-27cancelled 2022-12-20
Successor callsigns
Callsigns held now by people who previously held KC9AJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC9AJ, oldest first.
- DENK SR, FRANK W TX1999-12-09 → cancelled 2012-03-07
- Simms, Aaron J MN2022-12-20 active