Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4ZR callsign genealogy
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 WP4ZR's current licensee, walking backwards.
- Rios Ramos, JesusPRgranted 2017-03-29cancelled 2017-06-30
Successor callsigns
Callsigns held now by people who previously held WP4ZR.
- VIZCARRONDO, RAMONPRgranted 1999-08-02cancelled 2011-08-03
All historical holders
Every license row we've seen with the callsign WP4ZR, oldest first.
- Rios Ramos, Jesus PR2017-06-30 active
- —— → cancelled 1999-08-02