Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W1IUP callsign genealogy
Currently held by DE PETRILLO, THOMAS L
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 W1IUP's current licensee, walking backwards.
- DePetrillo, Thomas LRIgranted 2002-09-03cancelled 2002-12-03
Successor callsigns
Callsigns held now by people who previously held W1IUP.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1IUP, oldest first.
- DE PETRILLO, THOMAS L RI1988-07-12 → cancelled 2000-07-13
- DePetrillo, Thomas L RI2023-03-08 active