Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC0EF callsign genealogy
Currently held by Thompson, John 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 AC0EF's current licensee, walking backwards.
- Thompson, John MMNgranted 2005-07-21cancelled 2006-02-22
Successor callsigns
Callsigns held now by people who previously held AC0EF.
No current licensee on record previously held this callsign.