Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4MFF callsign genealogy
Currently held by NIEVES, ERNESTO R
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 WP4MFF's current licensee, walking backwards.
- NIEVES TRINIDAD, ERNESTOPRgranted 2015-10-07cancelled 2017-03-03
Successor callsigns
Callsigns held now by people who previously held WP4MFF.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4MFF, oldest first.
- NIEVES, ERNESTO R PR1993-07-06 → cancelled 2005-07-07
- NIEVES TRINIDAD, ERNESTO PR2017-03-03 active