Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KD0DD callsign genealogy
Currently held by HONSVALL, RALPH I
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 KD0DD's current licensee, walking backwards.
- KNOWLES, DAVID HSDgranted 2021-11-05cancelled 2022-01-25
Successor callsigns
Callsigns held now by people who previously held KD0DD.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KD0DD, oldest first.
- HONSVALL, RALPH I MN2008-02-08 → cancelled 2020-03-27
- KNOWLES, DAVID H SD2022-01-25 active