Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W9DJM callsign genealogy
Currently held by Mack, David J
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 W9DJM's current licensee, walking backwards.
- Mack, David JILgranted 2019-07-26cancelled 2020-04-24
Successor callsigns
Callsigns held now by people who previously held W9DJM.
No current licensee on record previously held this callsign.