Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4GUS callsign genealogy
Currently held by SIRI, GUSTAVO D
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 K4GUS's current licensee, walking backwards.
- CLARK, JONATHAN MWAgranted 2016-10-18cancelled 2024-01-17
Successor callsigns
Callsigns held now by people who previously held K4GUS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4GUS, oldest first.
- JUSTICE, GETHER A TN1998-04-22 → cancelled 2010-04-23
- SIRI, GUSTAVO D FL2011-11-22 → cancelled 2023-11-23
- CLARK, JONATHAN M WA2024-01-17 active