Confidence: Medium · Source: FCC ULS · As of 2026-09-11
AD4JS callsign genealogy
Currently held by SMITH III, JOHN L
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 AD4JS's current licensee, walking backwards.
- SMITH III, JOHN LNCgranted 2007-05-31cancelled 2012-03-16
Successor callsigns
Callsigns held now by people who previously held AD4JS.
- Cruz, Juan N NPRgranted 2023-11-02
All historical holders
Every license row we've seen with the callsign AD4JS, oldest first.
- CRUZ FIGUEROA, JUAN N PR2003-06-19 → cancelled 2003-06-20
- SMITH III, JOHN L NC2012-03-16 → cancelled 2024-03-19