Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1IOK callsign genealogy
Currently held by LITWINOWICH, ZENON 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 W1IOK's current licensee, walking backwards.
- Turlo, CasimirCAgranted 2020-10-30cancelled 2022-12-23
Successor callsigns
Callsigns held now by people who previously held W1IOK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1IOK, oldest first.
- LITWINOWICH, ZENON J ME2008-05-31 → cancelled 2020-07-21
- Turlo, Casimir CA2022-12-23 active