Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC1SM callsign genealogy
Currently held by BRESNAN, BRIAN 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 AC1SM's current licensee, walking backwards.
- BRESNAN, BRIAN AMEgranted 2024-06-18cancelled 2024-08-14
Successor callsigns
Callsigns held now by people who previously held AC1SM.
- BRESNAN, BRIAN AMAgranted 2025-12-09