Confidence: Medium · Source: FCC ULS · As of 2026-09-12
KP4BY callsign genealogy
Currently held by Puerto Rico CW And Contest Group
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 KP4BY's current licensee, walking backwards.
- WP4NPEcancelledPuerto Rico CW And Contest GroupPRgranted 2004-01-20cancelled 2004-02-24
Successor callsigns
Callsigns held now by people who previously held KP4BY.
- KP4MQactivePuerto Rico CW And Contest GroupPRgranted 2025-05-28