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

KF4MJM callsign genealogy

Currently held by RODRIGUEZ, JULIO E

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 KF4MJM's current licensee, walking backwards.

  1. W4ACHactive· G
    Harbour, Corey AVAgranted 2025-03-21
  2. KM4ZLNcancelled· G
    Harbour, Corey AVAgranted 2016-12-07cancelled 2025-03-21

Successor callsigns

Callsigns held now by people who previously held KF4MJM.

  1. KV4NDcancelled· E
    RODRIGUEZ, JULIO EFLgranted 2012-07-06cancelled 2013-12-24
  2. W4ACHcancelled· G
    RODRIGUEZ, JULIO EFLgranted 2011-03-29cancelled 2011-11-19
  3. N4RRNcancelled· G
    RODRIGUEZ, JULIO EFLgranted 2005-06-10cancelled 2010-12-28

All historical holders

Every license row we've seen with the callsign KF4MJM, oldest first.

  • RODRIGUEZ, JULIO E FL
    1997-12-09 → cancelled 2005-06-10
  • RODRIGUEZ, JULIO E FL
    2010-12-28 → cancelled 2011-03-29
  • RODRIGUEZ, JULIO E FL
    2012-07-06 → cancelled 2013-05-06
  • RODRIGUEZ, JULIO E FL
    2021-08-10 active
← Back to KF4MJM License history →