Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD4MST callsign genealogy
Currently held by STEED JR, THOMAS J
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 WD4MST's current licensee, walking backwards.
- Steed Jr, Thomas JSCgranted 2020-10-30cancelled 2020-11-17
Successor callsigns
Callsigns held now by people who previously held WD4MST.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WD4MST, oldest first.
- STEED JR, THOMAS J SC2008-04-29 → cancelled 2020-07-17
- Steed Jr, Thomas J SC2020-11-17 active