Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AI4QT callsign genealogy
Currently held by Robertson, William O
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 AI4QT's current licensee, walking backwards.
- Robertson, William OALgranted 2003-06-09cancelled 2006-08-12
Successor callsigns
Callsigns held now by people who previously held AI4QT.
No current licensee on record previously held this callsign.