Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W4RJK callsign genealogy
Currently held by KOZIOMKOWSKI, ROBERT 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 W4RJK's current licensee, walking backwards.
- KITNER, RONNIETNgranted 2022-04-18cancelled 2022-05-06
Successor callsigns
Callsigns held now by people who previously held W4RJK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4RJK, oldest first.
- KOZIOMKOWSKI, ROBERT J NC2008-12-20 → cancelled 2021-03-12
- KITNER, RONNIE TN2022-05-06 active