Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W0TZ callsign genealogy
Currently held by ZWOLAK, TIMOTHY
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 W0TZ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W0TZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W0TZ, oldest first.
- ZAPF, THOMAS L CO2009-12-30 → cancelled 2022-03-01
- ZWOLAK, TIMOTHY CO2022-03-18 active