A Pingback is one of three types of Linkbacks, methods for Web authors to request notification when somebody links to one of their documents.
https://en.wikipedia.org/wiki/Pingback
Syndication Techniques
Get access to data on 33,733,722 websites that are Pingback Support Customers. We know of 13,616,104 live websites using Pingback Support and an additional 20,117,618 sites that used Pingback Support historically and 1,504,976 websites in the United States.
Get a list of 33,733,722 websites using Pingback Support which includes location information, hosting data, contact details, 13,616,104 currently live websites and an additional 1,190,990 domains that redirect to sites in this list. 20,117,618 sites that used this technology previouslyand 1,504,976 websites in the United States currently using Pingback Support.
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