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 193,434 websites that are Google Web Server Customers. We know of 11,797 live websites using Google Web Server and an additional 181,637 sites that used Google Web Server historically and 7,221 websites in the United States.
Get a list of 193,434 websites using Google Web Server which includes location information, hosting data, contact details, 11,797 currently live websites and an additional 348,350 domains that redirect to sites in this list. 181,637 sites that used this technology previouslyand 7,221 websites in the United States currently using Google Web Server.
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