Google has off-loaded static content (Javascript/Images/CSS) to a different domain name in an effort to reduce bandwidth usage and increase network performance for the end user.
https://google.com
Content Delivery Network
Get access to data on 61,590,815 websites that are GStatic Google Static Content Customers. We know of 15,604,792 live websites using GStatic Google Static Content and an additional 45,986,023 sites that used GStatic Google Static Content historically and 2,187,972 websites in the United States.
Get a list of 61,590,815 websites using GStatic Google Static Content which includes location information, hosting data, contact details, 15,604,792 currently live websites and an additional 3,362,137 domains that redirect to sites in this list. 45,986,023 sites that used this technology previouslyand 2,187,972 websites in the United States currently using GStatic Google Static Content.
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