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 53,651,188 websites that are GStatic Google Static Content Customers. We know of 20,150,103 live websites using GStatic Google Static Content and an additional 33,501,085 sites that used GStatic Google Static Content historically and 3,239,817 websites in the United States.
Get a list of 53,651,188 websites using GStatic Google Static Content which includes location information, hosting data, contact details, 20,150,103 currently live websites and an additional 3,059,746 domains that redirect to sites in this list. 33,501,085 sites that used this technology previously and 3,239,817 websites in the United States currently using GStatic Google Static Content.
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