Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4HJM callsign genealogy
Currently held by PARKER, TOMMY
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 KO4HJM'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 KO4HJM.
- Parker, Tommy HALgranted 2020-10-16cancelled 2021-01-08