Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KI4DIO callsign genealogy
Currently held by Johnson, Robert 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 KI4DIO'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 KI4DIO.
- Johnson, Robert MTNgranted 2013-11-01cancelled 2026-03-06