Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KS4JP callsign genealogy
Currently held by KLOSOWSKI, JOHN M
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 KS4JP's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held KS4JP.
- KLOSOWSKI, JOHN MKYgranted 2010-04-17cancelled 2022-06-14