Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KD9GUI callsign genealogy
Currently held by Cook, Jeff M
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 KD9GUI'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 KD9GUI.
- Cook, Jeff MINgranted 2026-07-14