Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC2ZIO callsign genealogy
Currently held by Rudolph, John R
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 KC2ZIO's current licensee, walking backwards.
- Rudolph, John RNYgranted 2010-06-18cancelled 2010-10-28
Successor callsigns
Callsigns held now by people who previously held KC2ZIO.
- Rudolph, John RNYgranted 2021-05-04