Confidence: Medium · Source: FCC ULS · As of 2026-09-12
AB1ZX callsign genealogy
Currently held by Guimaraes Filho, Izirlei V
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 AB1ZX's current licensee, walking backwards.
- Guimaraes Filho, Izirlei VMAgranted 2015-08-20cancelled 2016-06-16
Successor callsigns
Callsigns held now by people who previously held AB1ZX.
- Guimaraes Filho, IzirleiMAgranted 2017-03-03