Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9DUM callsign genealogy
Currently held by MSM Alumni Radio Club
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 W9DUM's current licensee, walking backwards.
- KE0NJYcancelledMSM Alumni Radio ClubMOgranted 2017-05-19cancelled 2017-06-09
Successor callsigns
Callsigns held now by people who previously held W9DUM.
No current licensee on record previously held this callsign.