Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC0RJK callsign genealogy
Currently held by SULLIVAN, CHRISTIAN L
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 KC0RJK's current licensee, walking backwards.
- Kuehl, RobertMOgranted 2026-05-13cancelled 2026-06-02
Successor callsigns
Callsigns held now by people who previously held KC0RJK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC0RJK, oldest first.
- SULLIVAN, CHRISTIAN L CO2003-12-24 → cancelled 2015-12-25
- Kuehl, Robert MO2026-06-02 active