Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4DIA callsign genealogy
Currently held by FIELDS, WILLIAM F
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 W4DIA's current licensee, walking backwards.
- BARROS VILLAHERMOSA, CARLOSPRgranted 2016-03-10cancelled 2021-02-27
Successor callsigns
Callsigns held now by people who previously held W4DIA.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4DIA, oldest first.
- FIELDS, WILLIAM F NC1997-04-23 → cancelled 2009-04-24
- BARROS VILLAHERMOSA, CARLOS PR2021-02-27 active