Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W3GRZ callsign genealogy
Currently held by SIEGEL, MICHAEL I
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 W3GRZ's current licensee, walking backwards.
- Grizzell, Robert WILgranted 2025-05-21cancelled 2025-07-05
Successor callsigns
Callsigns held now by people who previously held W3GRZ.
- SIEGEL, MICHAEL IPAgranted 2022-03-08
All historical holders
Every license row we've seen with the callsign W3GRZ, oldest first.
- SIEGEL, MICHAEL I PA2016-11-08 → cancelled 2022-03-08
- Grizzell, Robert IL2025-07-05 active