Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4JRZ callsign genealogy
Currently held by Zimmerman, Justin R
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 W4JRZ's current licensee, walking backwards.
- Zimmerman, Justin RTNgranted 2015-08-14cancelled 2015-09-15
Successor callsigns
Callsigns held now by people who previously held W4JRZ.
- CALLAM, MICHAEL ENCgranted 2008-08-15cancelled 2014-12-02
All historical holders
Every license row we've seen with the callsign W4JRZ, oldest first.
- CALLAM, MICHAEL E NC2003-01-10 → cancelled 2008-08-15
- Zimmerman, Justin R TN2025-08-23 active