Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K9MFJ callsign genealogy
Currently held by Jacobs, Michael F
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 K9MFJ's current licensee, walking backwards.
- Jacobs, Michael FOHgranted 2014-05-19cancelled 2015-06-05
Successor callsigns
Callsigns held now by people who previously held K9MFJ.
No current licensee on record previously held this callsign.