Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9TDM callsign genealogy
Currently held by MADLEM, THOMAS D
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 W9TDM's current licensee, walking backwards.
- MADLEM, THOMAS DINgranted 2012-04-25cancelled 2012-07-03
Successor callsigns
Callsigns held now by people who previously held W9TDM.
No current licensee on record previously held this callsign.