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 193,209 websites that are Google Web Server Customers. We know of 13,486 live websites using Google Web Server and an additional 179,723 sites that used Google Web Server historically and 8,330 websites in the United States.
Get a list of 193,209 websites using Google Web Server which includes location information, hosting data, contact details, 13,486 currently live websites and an additional 386,581 domains that redirect to sites in this list. 179,723 sites that used this technology previouslyand 8,330 websites in the United States currently using Google Web Server.
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