Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4UT callsign genealogy
Currently held by RIVERA DE JESUS, ELLIE 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 KP4UT's current licensee, walking backwards.
- Schindler, Karl APRgranted 2018-08-07cancelled 2026-06-26
Successor callsigns
Callsigns held now by people who previously held KP4UT.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4UT, oldest first.
- RIVERA DE JESUS, ELLIE J PR2014-04-25 → cancelled 2025-02-19
- Schindler, Karl A PR2026-06-26 active