Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KO4RHO callsign genealogy
Currently held by Mallen, James P
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 KO4RHO'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 KO4RHO.
- Mallen Mr., James PFLgranted 2021-07-09