Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4JI callsign genealogy
Currently held by ISABELLA, JOSEPH M
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 KK4JI's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KK4JI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KK4JI, oldest first.
- MARTIN, ARTHUR R NC2006-11-08 → cancelled 2019-02-12
- ISABELLA, JOSEPH M FL2021-06-22 active