Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9OI callsign genealogy
Currently held by CHILDERS, MICHAEL 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 W9OI's current licensee, walking backwards.
- SHOEMAKER, CLIFFORD LILgranted 1998-04-10cancelled 2002-12-06
Successor callsigns
Callsigns held now by people who previously held W9OI.
- CHILDERS, MICHAEL CTXgranted 2020-09-17
All historical holders
Every license row we've seen with the callsign W9OI, oldest first.
- CHILDERS, MICHAEL C WI2000-06-23 → cancelled 2000-11-17
- Shoemaker 318, Cliff L IL2022-11-11 active