Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KF9B callsign genealogy
Currently held by BEIERMANN, MICHAEL 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 KF9B's current licensee, walking backwards.
- BEIERMANN, MICHAEL WILgranted 2008-09-09cancelled 2017-12-19
Successor callsigns
Callsigns held now by people who previously held KF9B.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KF9B, oldest first.
- HASSLER, CURTIS L IL2005-10-20 → cancelled 2017-11-29
- BEIERMANN, MICHAEL W IL2017-12-19 active