Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD9DK callsign genealogy
Currently held by Sonnentag, Jeffrey L
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 KD9DK's current licensee, walking backwards.
- Sonnentag, Jeffrey LWIgranted 2015-09-01cancelled 2015-10-23
Successor callsigns
Callsigns held now by people who previously held KD9DK.
No current licensee on record previously held this callsign.