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

N0SD callsign genealogy

Currently held by MAYFIELD, GARY 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 N0SD's current licensee, walking backwards.

  1. KK0SDcancelled· E
    MAYFIELD, GARY JSDgranted 2024-11-07cancelled 2024-12-27
  2. KS5Zactive· E
    Bajuk, Terence GTXgranted 2017-01-13
  3. KE5BLcancelled· E
    Bajuk, Terence GTXgranted 1998-02-27cancelled 2007-03-27

Successor callsigns

Callsigns held now by people who previously held N0SD.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign N0SD, oldest first.

  • WALTNER, JOHN R SD
    2016-08-02 → cancelled 2022-12-06
  • MAYFIELD, GARY J SD
    2024-12-27 active
← Back to N0SD License history →