Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC3LU callsign genealogy
Currently held by Mountcastle, John H
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 AC3LU's current licensee, walking backwards.
- Mountcastle, John HMDgranted 2023-07-04cancelled 2024-03-26
Successor callsigns
Callsigns held now by people who previously held AC3LU.
No current licensee on record previously held this callsign.