Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4NP callsign genealogy
Currently held by Robertson, Joel R
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 AI4NP's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AI4NP.
No current licensee on record previously held this callsign.