Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KU7D callsign genealogy
Currently held by Appel, Warren R
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 KU7D's current licensee, walking backwards.
- Appel, Warren RWYgranted 2007-06-06cancelled 2009-02-24
Successor callsigns
Callsigns held now by people who previously held KU7D.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KU7D, oldest first.
- JOHNSON, MILLARD C WY1997-01-27 → cancelled 2009-01-28
- Appel, Warren R WY2018-12-27 active