Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4T callsign genealogy
Currently held by Mercado-Vazquez, Walter
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 WP4T's current licensee, walking backwards.
- Mercado-Vazquez, WalterPRgranted 2002-02-19cancelled 2009-07-10
Successor callsigns
Callsigns held now by people who previously held WP4T.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign WP4T, oldest first.
- PEREZ, MANUEL PR1997-06-20 → cancelled 2009-06-23
- Mercado-Vazquez, Walter PR2019-07-06 active