Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4MO callsign genealogy
Currently held by PINEIRO, CARLOS A
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 WP4MO's current licensee, walking backwards.
- Ocasio, Angel MPRgranted 2011-03-01cancelled 2011-03-22
Successor callsigns
Callsigns held now by people who previously held WP4MO.
- Ocasio, Angel MGAgranted 2023-06-02
All historical holders
Every license row we've seen with the callsign WP4MO, oldest first.
- PINEIRO, CARLOS A PR1987-11-03 → cancelled 1999-11-04
- Ocasio, Angel M PR2021-04-13 → cancelled 2023-06-02