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Confidence: Medium · Source: FCC ULS · As of 2026-09-14

KD7RDY callsign genealogy

Currently held by RUDOLPH, JOHN S

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 KD7RDY's current licensee, walking backwards.

  1. KB7RDYcancelled· G
    RUDOLPH, JOHN SKYgranted 2020-01-14cancelled 2020-02-01
  2. KO4ASFcancelled· T
    RUDOLPH, JOHN SKYgranted 2019-12-26cancelled 2020-01-14

Successor callsigns

Callsigns held now by people who previously held KD7RDY.

  1. WB4SCWactive· G
    RUDOLPH, JOHN SINgranted 2026-06-19

All historical holders

Every license row we've seen with the callsign KD7RDY, oldest first.

  • GERBRANDT, CALEB W WA
    2002-05-01 → cancelled 2014-05-02
  • RUDOLPH, JOHN S IN
    2020-02-01 → cancelled 2026-06-19
← Back to KD7RDY License history →