Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KN4TOP callsign genealogy
Currently held by THOMPSON, MATTHEW K
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 KN4TOP's current licensee, walking backwards.
- THOMPSON, MATTHEW KNCgranted 2017-09-12cancelled 2017-09-30
Successor callsigns
Callsigns held now by people who previously held KN4TOP.
No current licensee on record previously held this callsign.