Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GDK callsign genealogy
Currently held by ULLMAN, DEBBIE
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 K4GDK's current licensee, walking backwards.
- ULLMAN, DEBBIEFLgranted 2020-08-27cancelled 2020-10-20
Successor callsigns
Callsigns held now by people who previously held K4GDK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4GDK, oldest first.
- DAILEY, CLYDE E FL1996-12-16 → cancelled 2008-12-17
- ULLMAN, DEBBIE FL2020-10-20 active