Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4JHN callsign genealogy
Currently held by ZOOK, LOUIS 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 K4JHN's current licensee, walking backwards.
- Gross, JohnTNgranted 2023-07-26cancelled 2023-12-08
Successor callsigns
Callsigns held now by people who previously held K4JHN.
- Gross, JohnTNgranted 2025-06-06cancelled 2025-08-12
All historical holders
Every license row we've seen with the callsign K4JHN, oldest first.
- ZOOK, LOUIS A FL1989-05-09 → cancelled 2001-05-10
- Gross, John TN2023-12-08 → cancelled 2025-06-06