Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB4FMD callsign genealogy
Currently held by Docktor 404, Frank M
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 KB4FMD's current licensee, walking backwards.
- Docktor, Frank MFLgranted 2007-03-27cancelled 2007-04-21
Successor callsigns
Callsigns held now by people who previously held KB4FMD.
No current licensee on record previously held this callsign.