Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4ECF callsign genealogy
Currently held by CASTRO, JULIO E
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 W4ECF's current licensee, walking backwards.
- CASTRO, JULIO EFLgranted 1995-03-16cancelled 2000-04-04
Successor callsigns
Callsigns held now by people who previously held W4ECF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4ECF, oldest first.
- BRITTON JR, WILLIAM B AL1987-11-03 → cancelled 1999-11-04
- CASTRO, JULIO E FL2020-01-13 active