Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K0MDO callsign genealogy
Currently held by Olson, Mark S
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 K0MDO's current licensee, walking backwards.
- Olson, Mark SMNgranted 2017-04-24cancelled 2017-05-16
Successor callsigns
Callsigns held now by people who previously held K0MDO.
No current licensee on record previously held this callsign.