Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4FWN callsign genealogy
Currently held by ROSA, CARLOS
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 WP4FWN's current licensee, walking backwards.
Successor callsigns
Callsigns held now by people who previously held WP4FWN.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4FWN, oldest first.
- ROSA, CARLOS PR2006-03-28 → cancelled 2009-11-24
- Rosa Martinez, Ruth PR2020-11-07 active