Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N4OIZ callsign genealogy
Currently held by SCHRAMM, DONALD G
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 N4OIZ'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 N4OIZ.
- SCHRAMM, DONALD GFLgranted 2006-02-22cancelled 2018-02-23