Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KC3YWO callsign genealogy
Currently held by ZIVIELLO, MICHAEL B
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 KC3YWO's current licensee, walking backwards.
- ZIVIELLO, MICHAEL BPAgranted 2024-01-30cancelled 2024-04-09
Successor callsigns
Callsigns held now by people who previously held KC3YWO.
No current licensee on record previously held this callsign.