Confidence: Medium · Source: FCC ULS · As of 2026-09-14
N6MTR callsign genealogy
Currently held by Shapiro, Mark
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 N6MTR's current licensee, walking backwards.
- Shapiro, MarkCAgranted 2024-06-06cancelled 2026-08-25
Successor callsigns
Callsigns held now by people who previously held N6MTR.
- WX6DactiveMountain West DMRCAgranted 2021-02-10
All historical holders
Every license row we've seen with the callsign N6MTR, oldest first.
- Fresno County VHF Magic Band Society CA2011-03-02 → cancelled 2011-03-26
- Shapiro, Mark CA2026-08-25 active