Confidence: Medium · Source: FCC ULS · As of 2026-09-12
WP4SDR callsign genealogy
Currently held by Cintron-Martinez, Sandra I
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 WP4SDR's current licensee, walking backwards.
- Cintron-Martinez, Sandra IPRgranted 2018-07-10cancelled 2018-08-14
Successor callsigns
Callsigns held now by people who previously held WP4SDR.
No current licensee on record previously held this callsign.