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

NP4AT callsign genealogy

Currently held by CRESPO VEGA, FRANCISCO

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 NP4AT's current licensee, walking backwards.

  1. WP4RFVcancelled· T
    TORRADO ROSADO, ALVINPRgranted 2019-09-03cancelled 2020-02-25

Successor callsigns

Callsigns held now by people who previously held NP4AT.

  1. KP4LGcancelled· E
    CRESPO VEGA, FRANCISCOPRgranted 2018-01-23cancelled 2024-07-02
  2. KP4Sactive· E
    ARROYO RODRIQUEZ, JUANPRgranted 2016-10-14

All historical holders

Every license row we've seen with the callsign NP4AT, oldest first.

  • CRESPO VEGA, FRANCISCO PR
    2017-03-17 → cancelled 2018-01-23
  • TORRADO ROSADO, ALVIN PR
    2020-02-25 active
← Back to NP4AT License history →