Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4DIO callsign genealogy
Currently held by Kniss, William F
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 W4DIO's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W4DIO.
- Kniss, William FTNgranted 2020-12-01