Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4OO callsign genealogy
Currently held by Nieves Febus, Lillian
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 WP4OO's current licensee, walking backwards.
- Nieves Febus, LillianPRgranted 2015-02-05cancelled 2015-10-02
Successor callsigns
Callsigns held now by people who previously held WP4OO.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4OO, oldest first.
- PEREZ, MAYRA E PR1988-05-10 → cancelled 2000-05-11
- Nieves Febus, Lillian PR2025-09-11 active