Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9GIO callsign genealogy
Currently held by Gioffredi, Matthew G
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 K9GIO's current licensee, walking backwards.
- Gioffredi, Matthew GWIgranted 2021-02-08cancelled 2021-03-02
Successor callsigns
Callsigns held now by people who previously held K9GIO.
No current licensee on record previously held this callsign.