Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K1OZR callsign genealogy
Currently held by Cotter, Justin
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 K1OZR's current licensee, walking backwards.
- Cotter, JustinAZgranted 2025-03-20cancelled 2026-06-06
Successor callsigns
Callsigns held now by people who previously held K1OZR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K1OZR, oldest first.
- TADDONIO JR, JOSEPH MA1998-04-03 → cancelled 2010-04-06
- Cotter, Justin AZ2026-06-06 active