Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0AJO callsign genealogy
Currently held by FILBERT SR, DONALD H
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 K0AJO's current licensee, walking backwards.
- O'Hare, Aaron JNCgranted 2021-02-16cancelled 2021-03-09
Successor callsigns
Callsigns held now by people who previously held K0AJO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0AJO, oldest first.
- FILBERT SR, DONALD H IA1995-07-19 → cancelled 2007-07-20
- O'Hare, Aaron J NC2021-03-09 active