Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1KOI callsign genealogy
Currently held by Duffy, Evan
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 W1KOI's current licensee, walking backwards.
- Duffy, EvanMAgranted 2024-03-23cancelled 2024-04-13
Successor callsigns
Callsigns held now by people who previously held W1KOI.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1KOI, oldest first.
- RIVELLI, FRANK P MA1994-05-24 → cancelled 2006-05-25
- Duffy, Evan MA2024-04-13 active