Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4HYJ callsign genealogy
Currently held by BLACKWOOD JR, HENRY O
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 K4HYJ's current licensee, walking backwards.
- BLACKWOOD JR, HENRY OGAgranted 2004-11-02cancelled 2011-08-26
Successor callsigns
Callsigns held now by people who previously held K4HYJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4HYJ, oldest first.
- KAUFMAN, MAXIME G FL1987-10-27 → cancelled 1999-10-28
- BLACKWOOD JR, HENRY O GA2021-09-29 active