Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KI4HZM callsign genealogy
Currently held by Madderra, Bob L
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 KI4HZM'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 KI4HZM.
- Madderra, Bob LGAgranted 2004-12-10cancelled 2005-04-22