Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4SJZ callsign genealogy
Currently held by ZAWACKI, STEPHEN J
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 W4SJZ's current licensee, walking backwards.
- ZAWACKI, STEPHEN JFLgranted 2020-06-20cancelled 2023-10-13
Successor callsigns
Callsigns held now by people who previously held W4SJZ.
- ZAWACKI, STEPHEN JFLgranted 2020-06-20cancelled 2023-10-13
All historical holders
Every license row we've seen with the callsign W4SJZ, oldest first.
- ZAWACKI, STEPHEN J FL2018-11-24 → cancelled 2020-06-20
- ZAWACKI, STEPHEN J FL2023-10-13 active