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

K0IV callsign genealogy

Currently held by HJERLEID JR, STANLEY O

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 K0IV's current licensee, walking backwards.

  1. W7ZOScancelled· E
    HJERLEID JR, STANLEY OCOgranted 2017-12-01cancelled 2018-02-24

Successor callsigns

Callsigns held now by people who previously held K0IV.

  1. W7ZOScancelled· E
    HJERLEID JR, STANLEY OCOgranted 2017-12-01cancelled 2018-02-24

All historical holders

Every license row we've seen with the callsign K0IV, oldest first.

  • Troth, Lyle J CO
    2010-12-23 → cancelled 2014-12-03
  • HJERLEID JR, STANLEY O CO
    2016-12-23 → cancelled 2017-12-01
  • HJERLEID JR, STANLEY O CO
    2018-02-24 active
← Back to K0IV License history →