Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4SFZ callsign genealogy
Currently held by RUTLEDGE, ROBERT Z
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 KM4SFZ's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KM4SFZ.
No current licensee on record previously held this callsign.