Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4SEK callsign genealogy
Currently held by CASTILLO MARCIAL, MARILYN
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 WP4SEK'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 WP4SEK.
- CASTILLO MARCIAL, MARILYNPRgranted 2022-02-26