Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W4ATT callsign genealogy
Currently held by CLAUSEN, DAVID A
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 W4ATT's current licensee, walking backwards.
- Shaw Jr, George AGAgranted 2003-03-07cancelled 2006-02-14
Successor callsigns
Callsigns held now by people who previously held W4ATT.
- CLAUSEN, DAVID AFLgranted 2018-09-11
All historical holders
Every license row we've seen with the callsign W4ATT, oldest first.
- SHAW JR, GEORGE A GA2025-12-12 active
- CLAUSEN, DAVID A— → cancelled 1998-11-24