Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W0NCR callsign genealogy
Currently held by KING SR, 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 W0NCR's current licensee, walking backwards.
- JAVENKOSKI, MICHAEL JMNgranted 2014-02-12cancelled 2021-02-17
Successor callsigns
Callsigns held now by people who previously held W0NCR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0NCR, oldest first.
- KING SR, ROBERT J MN2007-10-24 → cancelled 2019-12-04
- JAVENKOSKI, MICHAEL J MN2021-02-17 active