Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4MSM callsign genealogy
Currently held by McLain, Mark 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 W4MSM's current licensee, walking backwards.
- McLain, Mark STNgranted 2010-02-23cancelled 2010-03-23
Successor callsigns
Callsigns held now by people who previously held W4MSM.
No current licensee on record previously held this callsign.