Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4ZZA callsign genealogy
Currently held by Yost, William C
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 K4ZZA's current licensee, walking backwards.
- Yost, William CTNgranted 2022-03-24cancelled 2022-04-12
Successor callsigns
Callsigns held now by people who previously held K4ZZA.
- AYALA, JOSE GFLgranted 2018-05-30
All historical holders
Every license row we've seen with the callsign K4ZZA, oldest first.
- AYALA, JOSE G FL2006-11-03 → cancelled 2008-08-22
- Yost, William C TN2022-04-12 active