Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4JMZ callsign genealogy
Currently held by Trombley, James 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 W4JMZ's current licensee, walking backwards.
- Trombley, James JNYgranted 2017-04-10cancelled 2021-03-09
Successor callsigns
Callsigns held now by people who previously held W4JMZ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W4JMZ, oldest first.
- Zimmerman, John M FL2008-04-22 → cancelled 2020-04-23
- Trombley, James J NY2021-03-09 active