Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KX4SMH callsign genealogy
Currently held by Heffner, Steven M
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 KX4SMH's current licensee, walking backwards.
- Heffner, Steven MNCgranted 2004-01-07cancelled 2004-06-25
Successor callsigns
Callsigns held now by people who previously held KX4SMH.
No current licensee on record previously held this callsign.