Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W9IO callsign genealogy
Currently held by GREENWOOD, RUSSELL C
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 W9IO's current licensee, walking backwards.
- Kaminsky, Carl JINgranted 1999-11-02cancelled 2006-03-24
Successor callsigns
Callsigns held now by people who previously held W9IO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W9IO, oldest first.
- GREENWOOD, RUSSELL C IL1994-02-22 → cancelled 2006-02-23
- Kaminsky, Carl J IN2015-12-30 active