Atom Syndication Format is an XML language used for web feeds very similar to RSS.
https://en.wikipedia.org/wiki/Atom_%28standard%29
Syndication Techniques
Get access to data on 9,455,889 websites that are Atom Customers. We know of 2,584,283 live websites using Atom and an additional 6,871,606 sites that used Atom historically and 1,211,156 websites in the United States.
Get a list of 9,455,889 websites using Atom which includes location information, hosting data, contact details, 2,584,283 currently live websites and an additional 1,822,635 domains that redirect to sites in this list. 6,871,606 sites that used this technology previouslyand 1,211,156 websites in the United States currently using Atom.
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