Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO1MJC callsign genealogy
Currently held by Costa, Murilo
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 KO1MJC's current licensee, walking backwards.
- Costa, Murilo JNCgranted 2020-02-10cancelled 2020-02-28
Successor callsigns
Callsigns held now by people who previously held KO1MJC.
No current licensee on record previously held this callsign.