Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB9ONN callsign genealogy
Currently held by PFEIFER, MICHAEL L
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 KB9ONN's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KB9ONN.
- PFEIFER, MICHAEL LILgranted 2006-07-28cancelled 2013-08-23