Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4DDT callsign genealogy
Currently held by SIEDLECKI, THOMAS A
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 K4DDT's current licensee, walking backwards.
- FOREHAND, JACK JNCgranted 2010-04-09cancelled 2017-02-04
Successor callsigns
Callsigns held now by people who previously held K4DDT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4DDT, oldest first.
- SIEDLECKI, THOMAS A FL1994-07-14 → cancelled 2006-07-15
- FOREHAND, JACK J NC2017-02-04 active