GWS is Google's own web server implementation which lives behind closed doors.
https://en.wikipedia.org/wiki/Google_Web_Server
Web Servers
Get access to data on 165,857 websites Google Web Server Customers. We know of 11,290 live websites using Google Web Server and an additional 154,567 sites that used Google Web Server historically and 6,962 websites in the United States.
Get a list of 165,857 websites using Google Web Server which includes location information, hosting data, contact details, 11,290 currently live websites and an additional 299,888 domains that redirect to sites in this list. 154,567 sites that used this technology previouslyand 6,962 websites in the United States currently using Google Web Server.
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