Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KN0WTF callsign genealogy
Currently held by Friedman, Matthew H
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 KN0WTF's current licensee, walking backwards.
- Friedman, Matthew HCOgranted 2024-09-18cancelled 2024-10-08
Successor callsigns
Callsigns held now by people who previously held KN0WTF.
No current licensee on record previously held this callsign.