Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NI0C callsign genealogy
Currently held by GUENTHER JR, CHARLES 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 NI0C's current licensee, walking backwards.
- TIRELLI, MatthieuCAgranted 2025-02-26cancelled 2025-12-16
Successor callsigns
Callsigns held now by people who previously held NI0C.
- GUENTHER JR, CHARLES JWIgranted 2023-11-25
All historical holders
Every license row we've seen with the callsign NI0C, oldest first.
- GUENTHER JR, CHARLES J MO2015-10-27 → cancelled 2023-11-25
- TIRELLI, Matthieu CA2025-12-16 active