Confidence: Medium · Source: FCC ULS · As of 2026-09-12
NU2O callsign genealogy
Currently held by Underwood, Mark A
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 NU2O's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held NU2O.
No current licensee on record previously held this callsign.