Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4ZMB callsign genealogy
Currently held by BOLTON, BRIAN E
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 KC4ZMB's current licensee, walking backwards.
- DILLINGHAM, JAMES LALgranted 2005-09-02cancelled 2014-02-25
Successor callsigns
Callsigns held now by people who previously held KC4ZMB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4ZMB, oldest first.
- BOLTON, BRIAN E NC1991-04-23 → cancelled 2003-04-24
- DILLINGHAM, JAMES L AL2025-02-21 active