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

NP4CW callsign genealogy

Currently held by VELEZ MENDEZ, ALFREDO

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 NP4CW's current licensee, walking backwards.

  1. WP4XXcancelled· E
    JIMENEZ, ROLANDO VPRgranted 2013-08-30cancelled 2015-03-09
  2. NP3UNcancelled· G
    JIMENEZ, ROLANDO VPRgranted 2008-04-16cancelled 2013-08-30

Successor callsigns

Callsigns held now by people who previously held NP4CW.

  1. NM4Wactive· E
    PEREZ, WILLIAMGAgranted 2017-11-17

All historical holders

Every license row we've seen with the callsign NP4CW, oldest first.

  • MARTINEZ NIEVES, MODESTO PR
    1994-12-14 → cancelled 1999-10-07
  • Perez, William GA
    2003-02-15 → cancelled 2008-02-09
  • VELEZ MENDEZ, ALFREDO PR
    2020-01-14 active
← Back to NP4CW License history →