Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4U callsign genealogy
Currently held by Ulloa, Adrian 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 WA4U's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WA4U.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA4U, oldest first.
- OPPERT, JUDY C AL2017-01-10 → cancelled 2023-01-18
- Ulloa, Adrian F FL2025-02-08 active