This webpage has alternate versions available in Japanese via the use of the hreflang tag.
https://support.google.com/webmasters/answer/189077?hl=en
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Get access to data on 556,000 websites Japanese HREF LANG Customers. We know of 238,352 live websites using Japanese HREF LANG and an additional 317,648 sites that used Japanese HREF LANG historically and 105,179 websites in the United States.
Get a list of 556,000 websites using Japanese HREF LANG which includes location information, hosting data, contact details, 238,352 currently live websites and an additional 739,335 domains that redirect to sites in this list. 317,648 sites that used this technology previouslyand 105,179 websites in the United States currently using Japanese HREF LANG.
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