Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9JEF callsign genealogy
Currently held by PARKER, JEFFREY 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 K9JEF's current licensee, walking backwards.
- PARKER, JEFFREY RCAgranted 2016-05-24cancelled 2026-05-09
Successor callsigns
Callsigns held now by people who previously held K9JEF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9JEF, oldest first.
- KOBER, JOHN A WI2013-10-17 → cancelled 2026-03-06
- PARKER, JEFFREY R CA2026-05-09 active