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

NP4Y callsign genealogy

Currently held by Felix, Trabert M

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 NP4Y's current licensee, walking backwards.

  1. KP3MPcancelled· E
    PEREZ, MARIO LPRgranted 2018-12-27cancelled 2019-08-09
  2. WP4MPcancelled· E
    PEREZ, MARIO LPRgranted 2018-11-06cancelled 2018-12-27
  3. WP4QNHcancelled· T
    PEREZ, MARIO LPRgranted 2018-10-18cancelled 2018-11-06

Successor callsigns

Callsigns held now by people who previously held NP4Y.

No current licensee on record previously held this callsign.

All historical holders

Every license row we've seen with the callsign NP4Y, oldest first.

  • Felix, Trabert M PR
    2007-05-01 → cancelled 2019-07-23
  • PEREZ, MARIO L PR
    2019-08-09 active
← Back to NP4Y License history →