uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

KO4SA callsign genealogy

Currently held by Koch, Stuart A

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 KO4SA's current licensee, walking backwards.

  1. KO4STcancelled· E
    Koch, Stuart AVAgranted 2021-04-10cancelled 2021-09-18
  2. KO4JJIcancelled· E
    Koch, Stuart AVAgranted 2020-11-16cancelled 2021-04-10

Successor callsigns

Callsigns held now by people who previously held KO4SA.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign KO4SA, oldest first.

  • SWAIM, DARRYL J FL
    2002-02-13 → cancelled 2014-05-13
  • Koch, Stuart A VA
    2021-09-18 active
← Back to KO4SA License history →