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

KM4AH callsign genealogy

Currently held by GERRINGER, RANDY 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 KM4AH's current licensee, walking backwards.

  1. K4OKAcancelled· E
    Thrower, Casey RALgranted 2021-02-09cancelled 2021-03-30
  2. N4GKScancelled· E
    Thrower, Casey RALgranted 2021-07-12cancelled 2025-06-14
  3. AF4CQcancelled· E
    Thrower, Casey RALgranted 2021-03-30cancelled 2021-07-12

Successor callsigns

Callsigns held now by people who previously held KM4AH.

  1. K4OKAcancelled· A
    GERRINGER, RANDY JNCgranted 2017-03-17cancelled 2017-10-31

All historical holders

Every license row we've seen with the callsign KM4AH, oldest first.

  • GERRINGER, RANDY J NC
    2007-09-27 → cancelled 2017-03-17
  • GERRINGER, RANDY J NC
    2017-10-31 active
← Back to KM4AH License history →