Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF9OC callsign genealogy
Currently held by Rust, Robert C
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 KF9OC's current licensee, walking backwards.
- Rust, Robert CFLgranted 2025-07-15cancelled 2025-08-26
Successor callsigns
Callsigns held now by people who previously held KF9OC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF9OC, oldest first.
- RUST, ROBERT C FL2013-01-16 → cancelled 2025-03-18
- Rust, Robert C FL2025-08-26 active