Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4NE callsign genealogy
Currently held by BURKHARDT SR, JAMES H
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 KO4NE's current licensee, walking backwards.
- GRILLO, JEFFREY JNCgranted 2017-01-12cancelled 2018-04-17
Successor callsigns
Callsigns held now by people who previously held KO4NE.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KO4NE, oldest first.
- BURKHARDT SR, JAMES H TN1991-11-26 → cancelled 2003-11-27
- GRILLO, JEFFREY J NC2018-04-17 active