Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4KO callsign genealogy
Currently held by HOFFMAN, ROBERT D
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 KK4KO's current licensee, walking backwards.
- WHITE, JOHN LALgranted 2013-03-08cancelled 2015-11-14
Successor callsigns
Callsigns held now by people who previously held KK4KO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4KO, oldest first.
- HOFFMAN, ROBERT D AL1993-02-02 → cancelled 2005-02-03
- WHITE, JOHN L AL2026-07-03 active