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

NP4AD callsign genealogy

Currently held by RODRIGUEZ SANTIAGO, JOSEPH

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 NP4AD's current licensee, walking backwards.

  1. KP4YAEcancelled· G
    RODRIGUEZ SANTIAGO, JOSEPHPRgranted 2022-02-25cancelled 2022-03-15
  2. WP4RSOcancelled· G
    RODRIGUEZ SANTIAGO, JOSEPHPRgranted 2021-02-22cancelled 2022-02-25

Successor callsigns

Callsigns held now by people who previously held NP4AD.

  1. KP4WTVactive· G
    TORRES VALENTIN, WILLIAMPRgranted 2018-01-17

All historical holders

Every license row we've seen with the callsign NP4AD, oldest first.

  • TORRES VALENTIN, WILLIAM PR
    2017-02-28 → cancelled 2018-01-17
  • RODRIGUEZ SANTIAGO, JOSEPH PR
    2022-03-15 active
← Back to NP4AD License history →