Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6FDT callsign genealogy
Currently held by Osbun, Jeffrey
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 W6FDT's current licensee, walking backwards.
- Osbun, JeffreyCAgranted 2018-07-23cancelled 2018-08-11
Successor callsigns
Callsigns held now by people who previously held W6FDT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6FDT, oldest first.
- FELL SR, ROBERT J MO2001-11-14 → cancelled 2014-02-12
- Osbun, Jeffrey CA2018-08-11 active