Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4KJM callsign genealogy
Currently held by Ullberg, Magnus
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 W4KJM's current licensee, walking backwards.
- Ullberg, MagnusKYgranted 2004-06-10cancelled 2004-07-02
Successor callsigns
Callsigns held now by people who previously held W4KJM.
No current licensee on record previously held this callsign.