Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD0IA callsign genealogy
Currently held by SULLIVAN, JOHN D
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 AD0IA's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AD0IA.
No current licensee on record previously held this callsign.