Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD4MBK callsign genealogy
Currently held by OSBORNE, CHARLES S
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 WD4MBK'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 WD4MBK.
- OSBORNE, CHARLES SNCgranted 2020-05-12