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

KD5U callsign genealogy

Currently held by Sawyer, John M

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 KD5U's current licensee, walking backwards.

  1. N5SZJcancelled· E
    Sawyer, John MTXgranted 2001-03-21cancelled 2011-03-29

Successor callsigns

Callsigns held now by people who previously held KD5U.

  1. WX5Mcancelled· E
    ALLEN, RUDOLPH DTXgranted 2009-03-10cancelled 2009-03-31
  2. AC6IFcancelled· E
    WOOD, MARK SHIgranted 2004-12-09cancelled 2004-12-10

All historical holders

Every license row we've seen with the callsign KD5U, oldest first.

  • ALLEN, RUDOLPH D TX
    2000-06-30 → cancelled 2009-03-10
  • Sawyer, John M TX
    2021-01-06 active
← Back to KD5U License history →