Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4OIO callsign genealogy
Currently held by Velasquez, Joseph B
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 W4OIO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W4OIO.
- Velasquez, Joseph BCAgranted 2026-02-14