Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KA4OWO callsign genealogy
Currently held by Brenner, Zachary 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 KA4OWO's current licensee, walking backwards.
- Brenner, Zachary JVAgranted 2016-09-01cancelled 2018-05-25
Successor callsigns
Callsigns held now by people who previously held KA4OWO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KA4OWO, oldest first.
- DUMAS, ROBERT E AL1995-03-07 → cancelled 2007-03-08
- Brenner, Zachary J VA2018-05-25 active