Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AA4ZX callsign genealogy
Currently held by WILLIAMSON, DAVID 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 AA4ZX's current licensee, walking backwards.
- Williamson, David CWVgranted 2013-04-17cancelled 2014-01-31
Successor callsigns
Callsigns held now by people who previously held AA4ZX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AA4ZX, oldest first.
- WILLIAMSON, DAVID C WV1998-02-25 → cancelled 2010-02-26
- Williamson, David C WV2014-01-31 → cancelled 2026-03-07