Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KK4RAJ callsign genealogy
Currently held by JURGONSKI, RUTH A
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 KK4RAJ's current licensee, walking backwards.
- JURGONSKI, RUTH AFLgranted 2012-01-04cancelled 2016-09-09
Successor callsigns
Callsigns held now by people who previously held KK4RAJ.
- HILDRETH JR, MICHAEL KFLgranted 2014-08-01cancelled 2026-08-06
All historical holders
Every license row we've seen with the callsign KK4RAJ, oldest first.
- HILDRETH JR, MICHAEL K FL2013-05-08 → cancelled 2014-08-01
- JURGONSKI, RUTH A FL2026-07-14 active