Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WN4O callsign genealogy
Currently held by Bortolin, Dennis 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 WN4O's current licensee, walking backwards.
- Bortolin, Dennis MTNgranted 2019-09-20cancelled 2020-06-02
Successor callsigns
Callsigns held now by people who previously held WN4O.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WN4O, oldest first.
- KIRBY JR, JOHN T FL2009-12-30 → cancelled 2018-05-14
- Bortolin, Dennis M TN2020-06-02 active