Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4JOM callsign genealogy
Currently held by Mason, James O
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 KO4JOM's current licensee, walking backwards.
- MASON, JAMES OSCgranted 2020-05-26cancelled 2020-06-19
Successor callsigns
Callsigns held now by people who previously held KO4JOM.
- Mason, James OSCgranted 2020-07-07