A *nix based operating system (undisclosed).
https://en.wikipedia.org/wiki/Unix
Operating Systems and Servers
Get access to data on 10,194,320 websites that are Unix Customers. We know of 2,228,584 live websites using Unix and an additional 7,965,736 sites that used Unix historically and 589,344 websites in the United States.
Get a list of 10,194,320 websites using Unix which includes location information, hosting data, contact details, 2,228,584 currently live websites and an additional 532,412 domains that redirect to sites in this list. 7,965,736 sites that used this technology previouslyand 589,344 websites in the United States currently using Unix.
Countries
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