Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0ISZ callsign genealogy
Currently held by SCHULDHEISZ, DAVID 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 K0ISZ's current licensee, walking backwards.
- SCHULDHEISZ, DAVID RMNgranted 2005-02-18cancelled 2015-02-07
Successor callsigns
Callsigns held now by people who previously held K0ISZ.
No current licensee on record previously held this callsign.