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Confidence: Medium · Source: FCC ULS · As of 2026-09-12

NP4RM callsign genealogy

Currently held by Ramirez-Machin, Oscar

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 NP4RM's current licensee, walking backwards.

  1. WP4RLQcancelled· T
    Ramirez-Machin, OscarPRgranted 2020-03-10cancelled 2020-04-07

Successor callsigns

Callsigns held now by people who previously held NP4RM.

  1. KP4RRMactive· E
    MORALES VELEZ, RAUL RPRgranted 2018-03-16

All historical holders

Every license row we've seen with the callsign NP4RM, oldest first.

  • MERCADO, RAMON PR
    1999-01-07 → cancelled 2011-01-08
  • MORALES VELEZ, RAUL R PR
    2018-02-17 → cancelled 2018-03-16
  • Ramirez-Machin, Oscar PR
    2020-04-07 active
← Back to NP4RM License history →