Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W5MSO callsign genealogy
Currently held by O'Rourke, Michael 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 W5MSO's current licensee, walking backwards.
- O'Rourke, Michael SFLgranted 2004-09-22cancelled 2004-10-15
Successor callsigns
Callsigns held now by people who previously held W5MSO.
No current licensee on record previously held this callsign.