Confidence: Medium · Source: FCC ULS · As of 2026-09-12
K4SJ callsign genealogy
Currently held by Ariens, Jeffrey J
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 K4SJ's current licensee, walking backwards.
- Ariens, Jeffrey JFLgranted 2024-11-30cancelled 2025-01-28
Successor callsigns
Callsigns held now by people who previously held K4SJ.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K4SJ, oldest first.
- ANDERSON, PHILIP F NY1997-12-16 → cancelled 2002-02-04
- WAREHAM, DONALD K FL2014-01-01 → cancelled 2023-01-09
- Ariens, Jeffrey J FL2025-01-28 active