Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KK5JSC callsign genealogy
Currently held by CLAUSIUS, JEFF
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 KK5JSC's current licensee, walking backwards.
- CLAUSIUS, JEFFTXgranted 2024-09-24cancelled 2026-02-27
Successor callsigns
Callsigns held now by people who previously held KK5JSC.
No current licensee on record previously held this callsign.