Confidence: Medium · Source: FCC ULS · As of 2026-09-12
W6ATS callsign genealogy
Currently held by Sheffield, Andrew T
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 W6ATS's current licensee, walking backwards.
- Sheffield, Andrew TTXgranted 2018-03-13cancelled 2018-04-03
Successor callsigns
Callsigns held now by people who previously held W6ATS.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign W6ATS, oldest first.
- DOTY, JOHN S CA1994-08-24 → cancelled 2006-08-25
- Sheffield, Andrew T CA2018-04-03 active