Confidence: Medium · Source: FCC ULS · As of 2026-09-15
KZ4UO callsign genealogy
Currently held by Irving, Thomas
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 KZ4UO's current licensee, walking backwards.
- Irving, ThomasNCgranted 2021-08-16cancelled 2025-06-26
Successor callsigns
Callsigns held now by people who previously held KZ4UO.
No current licensee on record previously held this callsign.