Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KA5OIZ callsign genealogy
Currently held by Franzblau, David C
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 KA5OIZ's current licensee, walking backwards.
- Franzblau, David CINgranted 2026-02-06cancelled 2026-02-28
Successor callsigns
Callsigns held now by people who previously held KA5OIZ.
No current licensee on record previously held this callsign.