Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD4RTH callsign genealogy
Currently held by Williams, Michael S
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 WD4RTH's current licensee, walking backwards.
- Williams, Michael SNEgranted 2016-05-03cancelled 2016-05-24
Successor callsigns
Callsigns held now by people who previously held WD4RTH.
No current licensee on record previously held this callsign.