Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9WOK callsign genealogy
Currently held by LANDECK, JOHN H
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 W9WOK's current licensee, walking backwards.
- WIRTZ, MARK DINgranted 2012-09-25cancelled 2020-08-18
- WB9FFKno FCC ULS record on file
Successor callsigns
Callsigns held now by people who previously held W9WOK.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9WOK, oldest first.
- LANDECK, JOHN H IL2006-08-18 → cancelled 2018-09-20
- WIRTZ, MARK D IN2020-08-18 active