Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KI4SDU callsign genealogy
Currently held by Howse, Douglas J
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 KI4SDU's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KI4SDU.
- Howse, Douglas JFLgranted 2006-12-05cancelled 2007-12-01