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

KM4JB callsign genealogy

Currently held by HARBIN, STEVEN 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 KM4JB's current licensee, walking backwards.

  1. KT4JMBcancelled· E
    Boulware Jr, John MNCgranted 2024-12-10cancelled 2025-08-29
  2. KQ4YZCcancelled· T
    Boulware Jr, John MNCgranted 2024-11-22cancelled 2024-12-10

Successor callsigns

Callsigns held now by people who previously held KM4JB.

  1. W8WSactive· E
    BURDEN JR, JOHN RVAgranted 2022-01-28
  2. KT5Gactive· E
    HARBIN, STEVEN ATXgranted 2020-12-15

All historical holders

Every license row we've seen with the callsign KM4JB, oldest first.

  • HARBIN, STEVEN A TX
    2010-12-21 → cancelled 2011-02-05
  • BURDEN JR, JOHN R VA
    2017-04-18 → cancelled 2022-01-28
  • Boulware Jr, John M NC
    2025-08-29 active
← Back to KM4JB License history →