Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AC1BM callsign genealogy
Currently held by Denno, Marc 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 AC1BM's current licensee, walking backwards.
- MACDONALD, BRUCENHgranted 2014-12-04cancelled 2020-04-07
Successor callsigns
Callsigns held now by people who previously held AC1BM.
- Denno, Marc WCTgranted 2017-01-07cancelled 2018-01-30
All historical holders
Every license row we've seen with the callsign AC1BM, oldest first.
- Denno, Marc W CT2016-12-20 → cancelled 2017-01-07
- MACDONALD, BRUCE NH2020-04-07 active