Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K3DJM callsign genealogy
Currently held by Montgomery Sr, 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 K3DJM's current licensee, walking backwards.
- May, Donald JAZgranted 2017-11-02cancelled 2017-12-29
Successor callsigns
Callsigns held now by people who previously held K3DJM.
All historical holders
Every license row we've seen with the callsign K3DJM, oldest first.
- Montgomery Sr, David J CA2010-09-14 → cancelled 2012-05-11
- May, Donald J AZ2017-12-29 → cancelled 2022-07-09