Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB6DM callsign genealogy
Currently held by HOWARD, SHELDON
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 AB6DM's current licensee, walking backwards.
- Mason, Daniel JCAgranted 2015-03-23cancelled 2015-10-14
Successor callsigns
Callsigns held now by people who previously held AB6DM.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign AB6DM, oldest first.
- Mason, Daniel J CA2025-08-26 active
- HOWARD, SHELDON— → cancelled 1998-04-02