Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WO4J callsign genealogy
Currently held by HAGAN, JEFF S
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 WO4J's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WO4J.
- RYAN, MICHAEL JTNgranted 2018-11-15
All historical holders
Every license row we've seen with the callsign WO4J, oldest first.
- HAGAN, JEFF S FL2021-04-12 active
- RYAN, MICHAEL J— → cancelled 1999-01-28