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 61,527,074 websites that are GStatic Google Static Content Customers. We know of 16,871,026 live websites using GStatic Google Static Content and an additional 44,656,048 sites that used GStatic Google Static Content historically and 2,573,157 websites in the United States.
Get a list of 61,527,074 websites using GStatic Google Static Content which includes location information, hosting data, contact details, 16,871,026 currently live websites and an additional 3,391,654 domains that redirect to sites in this list. 44,656,048 sites that used this technology previouslyand 2,573,157 websites in the United States currently using GStatic Google Static Content.
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