Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9CDU callsign genealogy
Currently held by SHUPPERT, WILLIAM G
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 W9CDU's current licensee, walking backwards.
- Unger, Cory DINgranted 2012-06-20cancelled 2015-10-14
Successor callsigns
Callsigns held now by people who previously held W9CDU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9CDU, oldest first.
- SHUPPERT, WILLIAM G IL2003-01-22 → cancelled 2015-04-14
- Unger, Cory D IN2025-09-19 active