Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4OK callsign genealogy
Currently held by MOORESIDE, DOUGLAS 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 W4OK's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W4OK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4OK, oldest first.
- MOORESIDE, DOUGLAS E TN1996-11-04 → cancelled 1997-05-15
- Frederick, Thomas C FL2024-09-07 active