Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4UIU callsign genealogy
Currently held by Kalergis, James B
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 K4UIU's current licensee, walking backwards.
- Kalergis, James BCAgranted 2016-05-19cancelled 2016-07-06
Successor callsigns
Callsigns held now by people who previously held K4UIU.
No current licensee on record previously held this callsign.