Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K6MDU callsign genealogy
Currently held by Usher, Martin 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 K6MDU's current licensee, walking backwards.
- Usher, Martin DCAgranted 2022-05-04cancelled 2022-11-08
Successor callsigns
Callsigns held now by people who previously held K6MDU.
No current licensee on record previously held this callsign.