Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC9ID callsign genealogy
Currently held by Shen, Michael F
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 AC9ID's current licensee, walking backwards.
- Shen, Michael FINgranted 2013-05-20cancelled 2014-05-03
Successor callsigns
Callsigns held now by people who previously held AC9ID.
No current licensee on record previously held this callsign.