Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MDO callsign genealogy
Currently held by OESTERLY, MORRIS D
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 K4MDO's current licensee, walking backwards.
- OESTERLY, MORRIS DKYgranted 2019-09-09cancelled 2019-09-27
Successor callsigns
Callsigns held now by people who previously held K4MDO.
No current licensee on record previously held this callsign.