Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KK4D callsign genealogy
Currently held by Sheffield Sr, Darrell L
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 KK4D's current licensee, walking backwards.
- Sheffield Sr, Darrell LTNgranted 2003-07-09cancelled 2005-02-05
Successor callsigns
Callsigns held now by people who previously held KK4D.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4D, oldest first.
- MATSON, H E FL1994-03-15 → cancelled 1999-04-26
- Sheffield Sr, Darrell L TN2025-02-15 active