Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K0IN callsign genealogy
Currently held by WATT, MARTIN D
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 K0IN's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held K0IN.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K0IN, oldest first.
- ARMSTRONG, JACK A AR2003-07-29 → cancelled 2012-11-09
- WATT, MARTIN D IA2024-09-07 active