Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1IZU callsign genealogy
Currently held by Cogswell, Roy T
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 N1IZU's current licensee, walking backwards.
- Cogswell, Roy TMEgranted 2017-08-02cancelled 2017-09-06
Successor callsigns
Callsigns held now by people who previously held N1IZU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N1IZU, oldest first.
- COGSWELL, ROY T ME1991-05-07 → cancelled 2003-05-08
- Cogswell, Roy T ME2017-09-06 active