Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4ROQ callsign genealogy
Currently held by MONTALVO CASTRO, NORBERTO
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 WP4ROQ's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held WP4ROQ.
- MONTALVO CASTRO, NORBERTOPRgranted 2023-03-24