Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NC4SO callsign genealogy
Currently held by O'Leary, Sean M
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 NC4SO's current licensee, walking backwards.
- O Leary, Sean MNCgranted 2011-07-02cancelled 2012-02-04
Successor callsigns
Callsigns held now by people who previously held NC4SO.
No current licensee on record previously held this callsign.