Confidence: Medium · Source: FCC ULS · As of 2026-09-14
WP4MZS callsign genealogy
Currently held by ZAPATA SANTIAGO, MILDRED
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 WP4MZS's current licensee, walking backwards.
- ZAPATA SANTIAGO, MILDREDPRgranted 2018-07-16cancelled 2018-09-07
Successor callsigns
Callsigns held now by people who previously held WP4MZS.
- RODRIGUEZ ROSAS, FABIANFLgranted 2005-07-07cancelled 2017-06-20
All historical holders
Every license row we've seen with the callsign WP4MZS, oldest first.
- RODRIGUEZ ROSAS, FABIAN FL1995-06-19 → cancelled 2005-01-27
- ZAPATA SANTIAGO, MILDRED PR2018-09-07 active