Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4LJJ callsign genealogy
Currently held by Giaccio, John J
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 KB4LJJ's current licensee, walking backwards.
- Giaccio, John JFLgranted 2024-09-12cancelled 2024-10-01
Successor callsigns
Callsigns held now by people who previously held KB4LJJ.
- Giaccio, John JFLgranted 2025-12-30