Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NN4TT callsign genealogy
Currently held by CLAUSEN, DAVID A
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 NN4TT's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NN4TT.
No current licensee on record previously held this callsign.