Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4PX callsign genealogy
Currently held by JOHNSTON III, JAMES W
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 AI4PX's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AI4PX.
No current licensee on record previously held this callsign.