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 60,605,005 websites that are GStatic Google Static Content Customers. We know of 16,546,221 live websites using GStatic Google Static Content and an additional 44,058,784 sites that used GStatic Google Static Content historically and 2,249,441 websites in the United States.
Get a list of 60,605,005 websites using GStatic Google Static Content which includes location information, hosting data, contact details, 16,546,221 currently live websites and an additional 3,368,442 domains that redirect to sites in this list. 44,058,784 sites that used this technology previouslyand 2,249,441 websites in the United States currently using GStatic Google Static Content.
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