Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KC4ZOO callsign genealogy
Currently held by CLARK III, JAMES 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 KC4ZOO's current licensee, walking backwards.
- Green, Thomas FTNgranted 2022-08-23cancelled 2022-09-13
Successor callsigns
Callsigns held now by people who previously held KC4ZOO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KC4ZOO, oldest first.
- CLARK III, JAMES A TN1991-04-30 → cancelled 2003-05-01
- Green, Thomas F TN2022-09-13 active