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

KX4CW callsign genealogy

Currently held by TOUSSAINT, MARK

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 KX4CW's current licensee, walking backwards.

  1. N1MTcancelled· E
    Toussaint, MarkFLgranted 2019-01-31cancelled 2025-09-27
  2. AJ1Xactive· E
    ZIMMATORE JR, JOHN JMAgranted 2025-11-25
  3. W4JJZactive· G
    RITACCO, PAUL AFLgranted 2016-10-15
  4. WA3HBEcancelled· G
    RITACCO, PAUL ADCgranted 2006-09-06cancelled 2016-10-15

Successor callsigns

Callsigns held now by people who previously held KX4CW.

  1. KP4CWactive· A
    BONILLA, EFRAIN SFLgranted 2014-07-23

All historical holders

Every license row we've seen with the callsign KX4CW, oldest first.

  • BONILLA, EFRAIN S FL
    2003-05-02 → cancelled 2004-10-08
  • TOUSSAINT, MARK FL
    2025-09-27 active
← Back to KX4CW License history →