Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4TO callsign genealogy
Currently held by Perez-Marcano, James
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 WP4TO's current licensee, walking backwards.
- Perez-Marcano, JamesPRgranted 2018-05-08cancelled 2018-06-01
Successor callsigns
Callsigns held now by people who previously held WP4TO.
- Perez-Marcano, JamesPRgranted 2019-09-04
All historical holders
Every license row we've seen with the callsign WP4TO, oldest first.
- PEREZ, JOSE R PR1989-01-31 → cancelled 2001-02-01
- Perez-Marcano, James PR2018-06-01 → cancelled 2019-09-04