Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WO4USA callsign genealogy
Currently held by O DUGGAN, THORNTON W
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 WO4USA's current licensee, walking backwards.
- O DUGGAN, THORNTON WNCgranted 2001-11-21cancelled 2009-07-21
Successor callsigns
Callsigns held now by people who previously held WO4USA.
No current licensee on record previously held this callsign.