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

KP4YM callsign genealogy

Currently held by RIVERA, JOSE 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 KP4YM's current licensee, walking backwards.

  1. WP4MOcancelled· E
    Ocasio, Angel MPRgranted 2021-04-13cancelled 2023-06-02
  2. KK4AOZcancelled· G
    Ocasio, Angel MPRgranted 2011-03-01cancelled 2011-03-22

Successor callsigns

Callsigns held now by people who previously held KP4YM.

  1. NP4Lcancelled· E
    RIVERA, JOSE APRgranted 2000-04-07cancelled 2001-10-16

All historical holders

Every license row we've seen with the callsign KP4YM, oldest first.

  • RIVERA, JOSE A PR
    1999-02-24 → cancelled 2000-04-07
  • Ocasio, Angel M GA
    2023-06-02 active
← Back to KP4YM License history →