Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4SIF callsign genealogy
Currently held by NEGRON VAZQUEZ, GERARDO J
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 WP4SIF'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 WP4SIF.
- NEGRON VAZQUEZ, GERARDO JPRgranted 2022-06-22