Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W8JDK callsign genealogy
Currently held by Knopp, John 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 W8JDK's current licensee, walking backwards.
- Knopp, John DOHgranted 1998-05-07cancelled 2004-11-20
Successor callsigns
Callsigns held now by people who previously held W8JDK.
- Knopp, John DTXgranted 2020-07-11