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 56,557,087 websites GStatic Google Static Content Customers. We know of 19,001,939 live websites using GStatic Google Static Content and an additional 37,555,148 sites that used GStatic Google Static Content historically and 2,472,886 websites in the United States.
Get a list of 56,557,087 websites using GStatic Google Static Content which includes location information, hosting data, contact details, 19,001,939 currently live websites and an additional 3,445,817 domains that redirect to sites in this list. 37,555,148 sites that used this technology previouslyand 2,472,886 websites in the United States currently using GStatic Google Static Content.
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