Confidence: Medium · Source: FCC ULS · As of 2026-09-14
W1ZH callsign genealogy
Currently held by SANFILIPPO, THOMAS D
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 W1ZH's current licensee, walking backwards.
- SANFILIPPO, THOMAS DMAgranted 2003-11-13cancelled 2011-09-13
Successor callsigns
Callsigns held now by people who previously held W1ZH.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W1ZH, oldest first.
- GAGNON SR, RICHARD L MA2008-10-31 → cancelled 2009-08-24
- SANFILIPPO, THOMAS D MA2021-07-17 active