Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4ROS callsign genealogy
Currently held by Radio Operators Del Sur De Puerto Rico
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 KP4ROS's current licensee, walking backwards.
- WP4PUHcancelledRadio Operators Del Sur De Puerto RicoPRgranted 2017-02-21cancelled 2017-03-20
Successor callsigns
Callsigns held now by people who previously held KP4ROS.
- ORTIZ, RAFAELPRgranted 2014-06-14cancelled 2017-08-29
All historical holders
Every license row we've seen with the callsign KP4ROS, oldest first.
- ORTIZ, RAFAEL PR2012-11-24 → cancelled 2014-06-14
- Radio Operators Del Sur De Puerto Rico PR2017-03-20 active