Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1MSW callsign genealogy
Currently held by Wilhelm, 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 W1MSW's current licensee, walking backwards.
- Wilhelm, Matthew SMAgranted 2009-10-22cancelled 2010-02-19
Successor callsigns
Callsigns held now by people who previously held W1MSW.
- Wilhelm, Matthew SMAgranted 2017-09-01