Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4AOK callsign genealogy
Currently held by RISTER, WINFORD M
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 W4AOK's current licensee, walking backwards.
- RISTER, WINFORD MFLgranted 2012-12-04cancelled 2019-02-09
- WB4MBLno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held W4AOK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4AOK, oldest first.
- DOWELL, BRUCE R FL2006-08-08 → cancelled 2018-11-06
- RISTER, WINFORD M FL2019-02-09 active