uls-tracker
Sign in
Confidence: Medium · Source: FCC ULS · As of 2026-09-12

KU4D callsign genealogy

Currently held by PFEFFER, MATTHIAS

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 KU4D's current licensee, walking backwards.

  1. AK4GWcancelled· E
    KAPP, STEVEN NFLgranted 2018-07-13cancelled 2021-03-02
  2. N4TTGcancelled· E
    KAPP, STEVEN NFLgranted 2008-10-02cancelled 2011-03-23

Successor callsigns

Callsigns held now by people who previously held KU4D.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign KU4D, oldest first.

  • PFEFFER, MATTHIAS GA
    2009-02-10 → cancelled 2021-02-11
  • KAPP, STEVEN N SC
    2021-03-02 active
← Back to KU4D License history →