Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4ISR callsign genealogy
Currently held by SANTIAGO RUIZ, IRIS N
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 KP4ISR's current licensee, walking backwards.
- SANTIAGO RUIZ, IRIS NPRgranted 2019-12-02cancelled 2020-01-10
Successor callsigns
Callsigns held now by people who previously held KP4ISR.
No current licensee on record previously held this callsign.