Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4PTO callsign genealogy
Currently held by EUSTAQUIO, CAL 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 W4PTO's current licensee, walking backwards.
- EUSTAQUIO, CAL JFLgranted 2004-08-18cancelled 2012-11-27
Successor callsigns
Callsigns held now by people who previously held W4PTO.
No current licensee on record previously held this callsign.