Confidence: Medium · Source: FCC ULS · As of 2026-09-09
WD8SDU callsign genealogy
Currently held by Koenig, Douglas O
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 WD8SDU's current licensee, walking backwards.
- Koenig, Douglas OOHgranted 2002-05-29cancelled 2002-09-21
Successor callsigns
Callsigns held now by people who previously held WD8SDU.
No current licensee on record previously held this callsign.