Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4KTO callsign genealogy
Currently held by Fontanez Casillas, Elizabeth
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 WP4KTO's current licensee, walking backwards.
- Fontanez Casillas, ElizabethPRgranted 2018-08-07cancelled 2019-08-06
Successor callsigns
Callsigns held now by people who previously held WP4KTO.
- PEREZ, EDWARDPRgranted 2017-07-08
All historical holders
Every license row we've seen with the callsign WP4KTO, oldest first.
- PEREZ, EDWARD PR2011-11-22 → cancelled 2017-07-08
- Fontanez Casillas, Elizabeth PR2019-08-06 active