Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4OQO callsign genealogy
Currently held by ESQUILIN, OSVALDO
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 WP4OQO'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 WP4OQO.
- ESQUILIN MARTINEZ, OSVALDOPRgranted 2023-02-22