Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6MRO callsign genealogy
Currently held by Rosumek, Markus
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 K6MRO's current licensee, walking backwards.
- Rosumek, MarkusCAgranted 2015-06-19cancelled 2015-07-10
Successor callsigns
Callsigns held now by people who previously held K6MRO.
- O'ROURKE, MARCOSCOgranted 2018-05-11
All historical holders
Every license row we've seen with the callsign K6MRO, oldest first.
- O'ROURKE, MARCOS CA2008-05-30 → cancelled 2008-08-08
- Rosumek, Markus NV2015-07-10 active