Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6MDM callsign genealogy
Currently held by MC KILLEN JR, JOHN M
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 W6MDM's current licensee, walking backwards.
- Morrow, Lloyd AAZgranted 2016-07-13cancelled 2016-08-02
Successor callsigns
Callsigns held now by people who previously held W6MDM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6MDM, oldest first.
- MC KILLEN JR, JOHN M CA1997-04-01 → cancelled 2009-04-02
- Morrow, Lloyd A AZ2026-06-23 active