Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AI4ZF callsign genealogy
Currently held by Ruhl, Donald J
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 AI4ZF'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 AI4ZF.
- Ruhl, Donald JFLgranted 2008-03-11cancelled 2009-03-27