Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1DWO callsign genealogy
Currently held by Costa, Matthew 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 W1DWO's current licensee, walking backwards.
- Costa, Matthew ANHgranted 2024-04-13cancelled 2026-01-06
Successor callsigns
Callsigns held now by people who previously held W1DWO.
No current licensee on record previously held this callsign.