Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB3RM callsign genealogy
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 KB3RM's current licensee, walking backwards.
- MAZZA, ROBERT JPAgranted 2003-03-06cancelled 2005-03-25
Successor callsigns
Callsigns held now by people who previously held KB3RM.
- ARMSTRONG, MICHAEL JAZgranted 2008-10-21cancelled 2020-11-26
All historical holders
Every license row we've seen with the callsign KB3RM, oldest first.
- MAZZA, ROBERT J PA2025-03-15 active
- —— → cancelled 1998-11-25