Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC3OS callsign genealogy
Currently held by Groff, Alfred C
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 AC3OS's current licensee, walking backwards.
- Groff, Alfred CMDgranted 2018-05-21cancelled 2025-05-05
Successor callsigns
Callsigns held now by people who previously held AC3OS.
No current licensee on record previously held this callsign.