Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4JCB callsign genealogy
Currently held by BEYER, JOHN 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 K4JCB's current licensee, walking backwards.
- BEYER, JOHN CGAgranted 2009-02-10cancelled 2009-03-31
Successor callsigns
Callsigns held now by people who previously held K4JCB.
- BROWN, JAMES CGAgranted 2025-12-23
All historical holders
Every license row we've seen with the callsign K4JCB, oldest first.
- Brown, James C AK1997-10-15 → cancelled 2005-07-06
- BEYER, JOHN C WI2019-01-31 active