Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KO4FDM callsign genealogy
Currently held by MILLER, FRANK D
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 KO4FDM's current licensee, walking backwards.
- Frank, Miller DTNgranted 2020-04-20cancelled 2020-05-12
Successor callsigns
Callsigns held now by people who previously held KO4FDM.
- MILLER, FRANK DTNgranted 2025-01-07