Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4JA callsign genealogy
Currently held by La Sierra Contest Group
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 KP4JA's current licensee, walking backwards.
- WP4TENcancelledLa Sierra Contest GroupPRgranted 2024-02-09cancelled 2024-02-27
Successor callsigns
Callsigns held now by people who previously held KP4JA.
- WP3ZactiveLa Sierra Contest GroupPRgranted 2024-08-09
All historical holders
Every license row we've seen with the callsign KP4JA, oldest first.
- OQUENDO LOPEZ, PEDRO I PR2011-10-05 → cancelled 2023-11-21
- La Sierra Contest Group PR2024-02-27 → cancelled 2024-08-09