Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N0TSO callsign genealogy
Currently held by Clark, Zachery A
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 N0TSO's current licensee, walking backwards.
- Clark, Zachery AOHgranted 2016-05-23cancelled 2016-06-10
Successor callsigns
Callsigns held now by people who previously held N0TSO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign N0TSO, oldest first.
- URBANEK, RODNEY D MI2004-03-23 → cancelled 2015-08-05
- Clark, Zachery A OH2026-04-14 active