Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4EM callsign genealogy
Currently held by CORNELL, MICHAEL D
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 KB4EM's current licensee, walking backwards.
- MAI, NORBERT LALgranted 2008-04-29cancelled 2013-02-15
Successor callsigns
Callsigns held now by people who previously held KB4EM.
- CORNELL, MICHAEL DGAgranted 2017-03-14
All historical holders
Every license row we've seen with the callsign KB4EM, oldest first.
- CORNELL, MICHAEL D CT2000-12-30 → cancelled 2007-06-09
- MAI, NORBERT L AL2023-03-23 active