Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NC4JM callsign genealogy
Currently held by MASON, JAMES 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 NC4JM's current licensee, walking backwards.
- Mason, James MNCgranted 2003-04-28cancelled 2003-06-10
Successor callsigns
Callsigns held now by people who previously held NC4JM.
No current licensee on record previously held this callsign.