Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W8GAC callsign genealogy
Currently held by Underwood, John S
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 W8GAC's current licensee, walking backwards.
- CASILLO, GREGGOHgranted 2024-08-30cancelled 2024-09-17
Successor callsigns
Callsigns held now by people who previously held W8GAC.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W8GAC, oldest first.
- Underwood, John S OH1998-02-25 → cancelled 2010-02-26
- Casillo, Gregg OH2024-09-17 active