Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MRO callsign genealogy
Currently held by Olds, Michael R
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 K4MRO's current licensee, walking backwards.
- Olds, Michael RVAgranted 2018-03-23cancelled 2018-04-20
Successor callsigns
Callsigns held now by people who previously held K4MRO.
No current licensee on record previously held this callsign.