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

KF4KMD callsign genealogy

Currently held by SHILLING, HAROLD T

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 KF4KMD's current licensee, walking backwards.

  1. KK3KKKcancelled· T
    SHILLING, HAROLD TFLgranted 2012-11-10cancelled 2013-12-04
  2. KK4JJVcancelled· T
    SHILLING, HAROLD TVAgranted 2012-05-18cancelled 2012-11-10
  3. K4OPSactive· G
    Costanzo, Louis JVAgranted 2019-08-20
  4. KN4VYRcancelled· T
    Costanzo, Louis JVAgranted 2019-07-25cancelled 2019-08-20

Successor callsigns

Callsigns held now by people who previously held KF4KMD.

  1. K4OPScancelled· T
    SHILLING, HAROLD TVAgranted 2002-08-13cancelled 2012-05-18

All historical holders

Every license row we've seen with the callsign KF4KMD, oldest first.

  • SHILLING, HAROLD T VA
    1997-05-16 → cancelled 2002-08-13
  • SHILLING, HAROLD T FL
    2013-12-04 → cancelled 2026-03-07
← Back to KF4KMD License history →