Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WA9WUM callsign genealogy
Currently held by Dermer, Gregory E
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 WA9WUM's current licensee, walking backwards.
- Dermer, Gregory EORgranted 2025-06-12cancelled 2025-07-01
Successor callsigns
Callsigns held now by people who previously held WA9WUM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WA9WUM, oldest first.
- DERMER, GREGORY E OR2013-01-11 → cancelled 2025-01-14
- Dermer, Gregory E OR2025-07-01 active