Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4KFO callsign genealogy
Currently held by SWEETSER, MICHAEL E
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 K4KFO's current licensee, walking backwards.
- SWEETSER, MICHAEL EGAgranted 2000-10-31cancelled 2007-03-10
Successor callsigns
Callsigns held now by people who previously held K4KFO.
No current licensee on record previously held this callsign.