Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4FMJ callsign genealogy
Currently held by Miller, Michael J
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 K4FMJ's current licensee, walking backwards.
- Miller, Michael JFLgranted 2010-01-20cancelled 2011-09-09
Successor callsigns
Callsigns held now by people who previously held K4FMJ.
- JOHNSON, FLORIAN MNCgranted 2018-11-29
All historical holders
Every license row we've seen with the callsign K4FMJ, oldest first.
- GRISWOLD, HOWARD R FL1987-12-08 → cancelled 1999-12-09
- JOHNSON, FLORIAN M NC2006-05-19 → cancelled 2009-02-24
- Miller, Michael J TN2021-07-27 active