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 192,204 websites that are Google Web Server Customers. We know of 13,392 live websites using Google Web Server and an additional 178,812 sites that used Google Web Server historically and 8,535 websites in the United States.
Get a list of 192,204 websites using Google Web Server which includes location information, hosting data, contact details, 13,392 currently live websites and an additional 405,546 domains that redirect to sites in this list. 178,812 sites that used this technology previouslyand 8,535 websites in the United States currently using Google Web Server.
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