Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AB4XX callsign genealogy
Currently held by DURHAM, 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 AB4XX's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AB4XX.
No current licensee on record previously held this callsign.