Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AD0IU callsign genealogy
Currently held by Steenburgh, Robert A
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 AD0IU's current licensee, walking backwards.
- Steenburgh, Robert ACOgranted 2004-07-03cancelled 2014-05-21
Successor callsigns
Callsigns held now by people who previously held AD0IU.
No current licensee on record previously held this callsign.