Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC9OY callsign genealogy
Currently held by GIERA, ADAM E
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 AC9OY's current licensee, walking backwards.
- GIERA, ADAM EILgranted 2009-01-29cancelled 2016-07-18
Successor callsigns
Callsigns held now by people who previously held AC9OY.
- GIERA, ADAM EILgranted 2019-08-13