Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4RX callsign genealogy
Currently held by Ramos, Ramon L
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 KP4RX's current licensee, walking backwards.
- Ramos Calderon, Ramon LPRgranted 2020-08-20cancelled 2020-09-26
Successor callsigns
Callsigns held now by people who previously held KP4RX.
- Hernandez, Ruben APRgranted 2018-05-30
All historical holders
Every license row we've seen with the callsign KP4RX, oldest first.
- RAUHUT, MATTHIAS PR1991-05-14 → cancelled 2003-05-15
- Hernandez, Ruben A PR2008-06-28 → cancelled 2008-07-18
- Ramos, Ramon L TX2020-09-26 active