Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SDX callsign genealogy
Currently held by Oakley, Matthew 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 W4SDX's current licensee, walking backwards.
- Oakley, Matthew ETNgranted 2017-06-12cancelled 2018-05-18
Successor callsigns
Callsigns held now by people who previously held W4SDX.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4SDX, oldest first.
- HALBROOKS, THOMAS J AL2006-01-04 → cancelled 2018-03-29
- Oakley, Matthew E TN2018-05-18 active