Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9DTO callsign genealogy
Currently held by ONDRISKA, DENNIS T
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 W9DTO's current licensee, walking backwards.
- ONDRISKA, DENNIS TILgranted 2005-11-01cancelled 2010-07-24
Successor callsigns
Callsigns held now by people who previously held W9DTO.
No current licensee on record previously held this callsign.