Confidence: Medium · Source: FCC ULS · As of 2026-09-11
KP4BKB callsign genealogy
Currently held by ESPADA MONTALVO, RUBEN
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 KP4BKB's current licensee, walking backwards.
- ESPADA, ARTURO RPRgranted 2015-06-15cancelled 2015-09-15
Successor callsigns
Callsigns held now by people who previously held KP4BKB.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign KP4BKB, oldest first.
- ESPADA MONTALVO, RUBEN PR1996-07-09 → cancelled 2006-02-25
- ESPADA, ARTURO R PR2025-08-13 active