Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4BJA callsign genealogy
Currently held by Au, Brion 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 K4BJA's current licensee, walking backwards.
- Au, Brion JALgranted 2019-07-15cancelled 2019-08-02
Successor callsigns
Callsigns held now by people who previously held K4BJA.
- ARGO, BILLY JGAgranted 2010-08-13cancelled 2022-08-16
All historical holders
Every license row we've seen with the callsign K4BJA, oldest first.
- ARGO, BILLY J GA2005-03-25 → cancelled 2010-08-13
- Au, Brion J AL2019-08-02 active