Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KM4SM 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 KM4SM's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held KM4SM.
- Morton, MikeFLgranted 2019-02-26
All historical holders
Every license row we've seen with the callsign KM4SM, oldest first.
- Morton, Michael S FL2017-04-04 → cancelled 2019-02-26
- —— → cancelled 1997-10-15