Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0TWO callsign genealogy
Currently held by DUFRAIN JR, WALTER F
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 K0TWO's current licensee, walking backwards.
- Weir, Thomas MWAgranted 2018-10-23cancelled 2018-12-04
Successor callsigns
Callsigns held now by people who previously held K0TWO.
- DUFRAIN JR, WALTER FMOgranted 2016-12-05
All historical holders
Every license row we've seen with the callsign K0TWO, oldest first.
- DUFRAIN JR, WALTER F MO2004-07-30 → cancelled 2007-02-13
- Weir, Thomas M WA2018-12-04 active