Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4CJB callsign genealogy
Currently held by BILLINGS, CHRISTOPHER J
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 K4CJB's current licensee, walking backwards.
- BILLINGS, CHRISTOPHER JFLgranted 2015-04-28cancelled 2024-05-31
Successor callsigns
Callsigns held now by people who previously held K4CJB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4CJB, oldest first.
- Brewer Jr, Clyde J VA2012-01-24 → cancelled 2024-03-20
- BILLINGS, CHRISTOPHER J FL2024-05-31 active