Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4HDJ callsign genealogy
Currently held by YALOWITZ, JEFFREY S
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 K4HDJ's current licensee, walking backwards.
- YALOWITZ, JEFFREY SALgranted 1997-10-06cancelled 1999-11-20
Successor callsigns
Callsigns held now by people who previously held K4HDJ.
No current licensee on record previously held this callsign.