Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4MDM callsign genealogy
Currently held by Martin, 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 K4MDM's current licensee, walking backwards.
- Martin, Mark DTNgranted 2002-04-01cancelled 2002-05-10
Successor callsigns
Callsigns held now by people who previously held K4MDM.
No current licensee on record previously held this callsign.