Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K6OI callsign genealogy
Currently held by HAIRSTON, MARION A
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 K6OI's current licensee, walking backwards.
- WONG, THEODORE WCAgranted 1998-09-30cancelled 2000-02-19
Successor callsigns
Callsigns held now by people who previously held K6OI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K6OI, oldest first.
- HAIRSTON, MARION A CA1987-12-29 → cancelled 1999-12-30
- WONG, THEODORE W CA2020-02-07 active