Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AA4IH callsign genealogy
Currently held by CASTO, WILLIAM 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 AA4IH's current licensee, walking backwards.
- Bronisz, Jonathan ETNgranted 2011-01-11cancelled 2012-07-06
Successor callsigns
Callsigns held now by people who previously held AA4IH.
- CASTO, WILLIAM WNCgranted 2014-05-13cancelled 2026-08-08
All historical holders
Every license row we've seen with the callsign AA4IH, oldest first.
- CASTO, WILLIAM W NC1998-08-28 → cancelled 2004-08-06
- Bronisz, Jonathan E TN2022-04-26 active