Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1KOA callsign genealogy
Currently held by BILLINGTON, WILLIAM R
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 W1KOA's current licensee, walking backwards.
- THOMASON, RICHARD RTNgranted 2022-04-01cancelled 2022-04-29
Successor callsigns
Callsigns held now by people who previously held W1KOA.
- BILLINGTON, WILLIAM RTXgranted 2017-10-28cancelled 2019-03-09
All historical holders
Every license row we've seen with the callsign W1KOA, oldest first.
- CRISTINA, HENRY J MA1996-07-17 → cancelled 2008-07-18
- BILLINGTON, WILLIAM R TX2016-10-21 → cancelled 2017-10-28
- Thomason, Richard L TN2022-04-29 active