Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC9JR callsign genealogy
Currently held by ZIMMER, CLARENCE 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 KC9JR's current licensee, walking backwards.
- Romeis, Joshua PWIgranted 2013-11-05cancelled 2017-04-21
Successor callsigns
Callsigns held now by people who previously held KC9JR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC9JR, oldest first.
- ZIMMER, CLARENCE L IN1996-08-05 → cancelled 2008-08-06
- Romeis, Joshua P WI2017-04-21 active