Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K4MBO callsign genealogy
Currently held by OLSON, MICHAEL B
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 K4MBO's current licensee, walking backwards.
- OLSON, MICHAEL BGAgranted 2004-03-31cancelled 2004-04-30
Successor callsigns
Callsigns held now by people who previously held K4MBO.
No current licensee on record previously held this callsign.