Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4TOI callsign genealogy
Currently held by OI, TERUO
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 W4TOI's current licensee, walking backwards.
- OI, TERUOTNgranted 2008-10-02cancelled 2008-10-24
Successor callsigns
Callsigns held now by people who previously held W4TOI.
- OI, TERUOWAgranted 2018-11-13
All historical holders
Every license row we've seen with the callsign W4TOI, oldest first.
- BISHOP SR, ERNEST L AL1995-04-27 → cancelled 2007-04-28
- OI, TERUO TN2008-10-24 → cancelled 2008-11-29