Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KX4UC callsign genealogy
Currently held by Jonink, Martin
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 KX4UC's current licensee, walking backwards.
- Jonink, MartinSCgranted 2019-06-28cancelled 2019-09-05
Successor callsigns
Callsigns held now by people who previously held KX4UC.
- Jonink, MartinSCgranted 2020-01-24