Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4PIN callsign genealogy
Currently held by Muniz Lopez, Efrain
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 WP4PIN's current licensee, walking backwards.
The current licensee has not held any other callsign on record.
Successor callsigns
Callsigns held now by people who previously held WP4PIN.
- Muniz Lopez, EfrainPRgranted 2025-02-04