Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KB7RM callsign genealogy
Currently held by BUTTERFIELD, MIKE J
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 KB7RM's current licensee, walking backwards.
- BUTTERFIELD, MIKE JAZgranted 2006-09-12cancelled 2015-03-27
Successor callsigns
Callsigns held now by people who previously held KB7RM.
No current licensee on record previously held this callsign.