Confidence: Medium · Source: FCC ULS · As of 2026-09-14
AI4ZL callsign genealogy
Currently held by Gupton, Steven S
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 AI4ZL's current licensee, walking backwards.
- Gupton, Steven SKYgranted 2007-03-13cancelled 2007-06-20
Successor callsigns
Callsigns held now by people who previously held AI4ZL.
No current licensee on record previously held this callsign.