Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WA4MDE callsign genealogy
Currently held by Estrada, Mark D
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 WA4MDE's current licensee, walking backwards.
- Estrada, Mark DFLgranted 2012-06-29cancelled 2012-07-24
Successor callsigns
Callsigns held now by people who previously held WA4MDE.
No current licensee on record previously held this callsign.