Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KM4KYM callsign genealogy
Currently held by COSTA, JOHN B
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 KM4KYM'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 KM4KYM.
- COSTA, JOHN BSCgranted 2015-06-03cancelled 2016-05-10