Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N1EFK callsign genealogy
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 N1EFK's current licensee, walking backwards.
- Kaufman, Eric FCAgranted 2018-02-16cancelled 2021-03-12
Successor callsigns
Callsigns held now by people who previously held N1EFK.
- RITCHIE, WARREN PNHgranted 1997-10-15cancelled 2009-10-16
All historical holders
Every license row we've seen with the callsign N1EFK, oldest first.
- Kaufman, Eric F CA2021-03-12 active
- —— → cancelled 1997-10-15