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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

K4OSO callsign genealogy

Currently held by Coleman Sr, Milton B

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 K4OSO's current licensee, walking backwards.

  1. WX3Mactive
    Southern Alleghenies Adventure Radio GroupPAgranted 2025-12-09
  2. KD3BXVcancelled
    Southern Alleghenies Adventure Radio GroupPAgranted 2025-09-18cancelled 2025-12-09

Successor callsigns

Callsigns held now by people who previously held K4OSO.

  1. WX3Mcancelled· E
    Coleman Sr, Milton BVAgranted 2021-10-13cancelled 2023-07-14

All historical holders

Every license row we've seen with the callsign K4OSO, oldest first.

  • Coleman Sr, Milton B VA
    2014-12-02 → cancelled 2021-10-13
  • Coleman Sr, Milton B VA
    2023-07-14 active
← Back to K4OSO License history →