Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4MDR callsign genealogy
Currently held by VOLKSTORF SR, JOHN E
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 W4MDR's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held W4MDR.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4MDR, oldest first.
- VOLKSTORF SR, JOHN E VA1995-05-25 → cancelled 2007-05-26
- Law, John C AL2017-06-07 active