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

WN9H callsign genealogy

Currently held by Mueller, Martin

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 WN9H's current licensee, walking backwards.

  1. AD9ENcancelled· E
    MUELLER, MARTINWIgranted 2023-08-02cancelled 2024-05-25
  2. KD9YRWcancelled· E
    MUELLER, MARTINWIgranted 2023-08-02cancelled 2024-04-29

Successor callsigns

Callsigns held now by people who previously held WN9H.

  1. WA4DXCactive· E
    FOX, NEIL DVAgranted 2022-05-06

All historical holders

Every license row we've seen with the callsign WN9H, oldest first.

  • KAKUMA, TSUTOMU IN
    2009-11-17 → cancelled 2021-12-28
  • FOX, NEIL D VA
    2022-02-19 → cancelled 2022-05-06
  • Mueller, Martin WI
    2024-05-25 active
← Back to WN9H License history →