Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K8CZ callsign genealogy
Currently held by ISGRO, THOMAS 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 K8CZ's current licensee, walking backwards.
- Clark, Roger LWVgranted 2018-11-21cancelled 2021-01-01
Successor callsigns
Callsigns held now by people who previously held K8CZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K8CZ, oldest first.
- ISGRO, THOMAS R OH2008-09-23 → cancelled 2020-12-10
- Clark, Roger L WV2021-01-01 active