Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WA4MD callsign genealogy
Currently held by McMaster, William N
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 WA4MD's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WA4MD.
No current licensee on record previously held this callsign.