Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4IS callsign genealogy
Currently held by ALVAREZ, HECTOR 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 KP4IS's current licensee, walking backwards.
- ALVAREZ, HECTOR LPRgranted 2005-05-25cancelled 2011-07-06
Successor callsigns
Callsigns held now by people who previously held KP4IS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4IS, oldest first.
- DOMINGUEZ SR, IVAN E PR1999-01-29 → cancelled 2011-02-01
- ALVAREZ, HECTOR L PR2021-05-14 active