Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4M callsign genealogy
Currently held by JOHNSON, MICHAEL T
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 KB4M's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KB4M.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KB4M, oldest first.
- Campbell, George N NC2004-05-03 → cancelled 2016-07-28
- JOHNSON, MICHAEL T NC2026-07-17 active