Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AG4ZL callsign genealogy
Currently held by CROWE, JOHN M
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 AG4ZL's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held AG4ZL.
- MARINO, GREGORY RFLgranted 2023-12-07
All historical holders
Every license row we've seen with the callsign AG4ZL, oldest first.
- MARINO, GREGORY R FL1998-11-04 → cancelled 2004-01-21
- CROWE, JOHN M NC2017-04-28 active