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

KP4RO callsign genealogy

Currently held by OJEDA, RAMON

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 KP4RO's current licensee, walking backwards.

  1. KP4RORcancelled· A
    OJEDA, RAMONPRgranted 2009-05-05cancelled 2016-06-21
  2. KP4ZFactive· E
    ROMAN, CARLOS AFLgranted 2023-06-28
  3. WP4ZFcancelled· E
    ROMAN, CARLOS APRgranted 2010-10-19cancelled 2013-07-30

Successor callsigns

Callsigns held now by people who previously held KP4RO.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign KP4RO, oldest first.

  • GALARZA, GUILLERMO PR
    1998-04-28 → cancelled 2010-04-29
  • OJEDA, RAMON PR
    2026-07-10 active
← Back to KP4RO License history →