Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K7NJB callsign genealogy
Currently held by Duffin, Robert L
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 K7NJB's current licensee, walking backwards.
- Duffin, Robert LAZgranted 2010-12-28cancelled 2012-05-12
Successor callsigns
Callsigns held now by people who previously held K7NJB.
No current licensee on record previously held this callsign.