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https://support.google.com/webmasters/answer/189077?hl=en
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Get access to data on 6,245,849 websites that are Spanish HREF LANG Customers. We know of 1,147,019 live websites using Spanish HREF LANG and an additional 5,098,830 sites that used Spanish HREF LANG historically and 502,288 websites in the United States.
Spanish HREF LANG websites that are also using other technologies.
Get a list of 6,245,849 websites using Spanish HREF LANG which includes location information, hosting data, contact details, 1,147,019 currently live websites and an additional 2,224,309 domains that redirect to sites in this list. 5,098,830 sites that used this technology previouslyand 502,288 websites in the United States currently using Spanish HREF LANG.
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