Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W3MDH callsign genealogy
Currently held by Heckendorn, 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 W3MDH's current licensee, walking backwards.
- Heckendorn, Mark DDCgranted 2003-09-04cancelled 2003-09-27
Successor callsigns
Callsigns held now by people who previously held W3MDH.
No current licensee on record previously held this callsign.