Confidence: Medium · Source: FCC ULS · As of 2026-09-12
N4MSW callsign genealogy
Currently held by Weirich, Matthew 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 N4MSW's current licensee, walking backwards.
- Weirich, Matthew SNCgranted 2019-06-28cancelled 2026-01-21
Successor callsigns
Callsigns held now by people who previously held N4MSW.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N4MSW, oldest first.
- OLIVER, TOM AL2005-04-01 → cancelled 2017-04-25
- Weirich, Matthew S NC2026-01-21 active