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

KA4EFO callsign genealogy

Currently held by Larson, Leslie W

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 KA4EFO's current licensee, walking backwards.

  1. KQ0Wactive· E
    KONECNY, LAWRENCE HKSgranted 2023-08-11
  2. KF0MYScancelled· E
    KONECNY, LAWRENCE HKSgranted 2023-06-08cancelled 2023-08-11

Successor callsigns

Callsigns held now by people who previously held KA4EFO.

  1. W5CFcancelled· E
    Larson, Leslie WNDgranted 2022-05-03cancelled 2024-05-25
  2. KQ0Wcancelled· E
    Larson, Leslie WNDgranted 2019-10-22cancelled 2021-05-28

All historical holders

Every license row we've seen with the callsign KA4EFO, oldest first.

  • Larson, Leslie W ND
    2014-10-03 → cancelled 2019-10-22
  • Larson, Leslie W AR
    2021-05-28 → cancelled 2022-05-03
← Back to KA4EFO License history →