Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD4RWO callsign genealogy
Currently held by Armstrong, Brian 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 KD4RWO's current licensee, walking backwards.
- Armstrong, Brian JGAgranted 2024-09-10cancelled 2024-09-28
Successor callsigns
Callsigns held now by people who previously held KD4RWO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD4RWO, oldest first.
- Armstrong, Brian J GA2012-05-26 → cancelled 2024-08-20
- Armstrong, Brian J GA2024-09-28 active