Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9JKU callsign genealogy
Currently held by EARL, MICHAEL R
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 K9JKU's current licensee, walking backwards.
- JEFFIERS, MARK AKYgranted 2012-04-03cancelled 2017-09-06
Successor callsigns
Callsigns held now by people who previously held K9JKU.
- EARL, MICHAEL RFLgranted 2025-05-09
All historical holders
Every license row we've seen with the callsign K9JKU, oldest first.
- EARL, MICHAEL R FL2014-12-09 → cancelled 2015-07-14
- JEFFIERS, MARK A KY2017-09-06 active