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

K6MEX callsign genealogy

Currently held by CASTILLO, CESAR A

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 K6MEX's current licensee, walking backwards.

  1. KI6YRKcancelled· T
    CASTILLO JR, CESAR ACAgranted 2009-04-23cancelled 2009-06-30

Successor callsigns

Callsigns held now by people who previously held K6MEX.

  1. W6JMXcancelled· E
    DE LEON, CARLOSCAgranted 2016-06-17cancelled 2016-08-16

All historical holders

Every license row we've seen with the callsign K6MEX, oldest first.

  • De Leon, Carlos CA
    2004-12-21 → cancelled 2006-07-18
  • CASTILLO, CESAR A CA
    2019-05-07 active
← Back to K6MEX License history →