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 56,639,704 websites GStatic Google Static Content Customers. We know of 19,366,192 live websites using GStatic Google Static Content and an additional 37,273,512 sites that used GStatic Google Static Content historically and 3,041,819 websites in the United States.
Get a list of 56,639,704 websites using GStatic Google Static Content which includes location information, hosting data, contact details, 19,366,192 currently live websites and an additional 3,417,817 domains that redirect to sites in this list. 37,273,512 sites that used this technology previouslyand 3,041,819 websites in the United States currently using GStatic Google Static Content.
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