Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WD4DDY callsign genealogy
Currently held by Mrosko, Mathew G
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 WD4DDY's current licensee, walking backwards.
- Mrosko, Mathew GCAgranted 2010-03-09cancelled 2010-04-20
Successor callsigns
Callsigns held now by people who previously held WD4DDY.
No current licensee on record previously held this callsign.