Confidence: Medium · Source: FCC ULS · As of 2026-09-14
KP4JJO callsign genealogy
Currently held by ORTIZ LUNA, JULIAN 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 KP4JJO's current licensee, walking backwards.
- Ortiz-Luna, Julian JPRgranted 2002-05-02cancelled 2002-08-20
Successor callsigns
Callsigns held now by people who previously held KP4JJO.
- ORTIZ LUNA, JULIAN JPRgranted 2021-01-05