Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC9GZ callsign genealogy
Currently held by Costello, William M
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 AC9GZ's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held AC9GZ.
- Costello, William MILgranted 2013-12-14cancelled 2026-03-07